Still hoarding supplies in the apocalypse? I'll just go on a killing spree and looting!

It's important to know that drones are small in size and fast in speed.

Even so, as it passed by the window, it was instantly caught by the chameleon's tongue.

My drone was destroyed on its very first appearance, and I felt a little sorry for it, but it was all really worth it.

Regardless of the humans who were found lying in ambush, the chameleon alone was worth the cost of this drone.

Footsteps came from the other end of the corridor.

Charlene walked at the front, her ponytail swaying over her shoulder. Three people followed behind her.

Xia Lin stood in front of Lin You.

"We've made up our minds. We'll leave today."

Lin You frowned and said, "There's been a small problem. There's a group of four people guarding the back door, and they're armed. They're waiting for someone to come out."

Charlene's expression changed slightly.

Qin Ying, standing behind her, adjusted her glasses; the expressions of the four of them were rather unpleasant.

The first person they met, Tao, who had a car, was Wang, a wealthy second-generation heir. He spoke first, asking, "What should we do?"

Lin You leaned against the wall, her arms crossed over her chest, watching the four people's unpleasant expressions.

The four naive college students felt that the four people were dangerous.

But in Lin You's opinion...

That chameleon hunting frog is the real danger.

Because it's likely already dead before you find it.

Lin You asked, "Can you tell me what that thing on the far right side of the third floor is used for?"

Qin Ying immediately replied, "The third floor, right side? You mean the biology lab?"

"I remember that place was like an experimental medicine lab, with some small animals like mice inside. What's wrong?" Charlene asked curiously.

"Are there any frogs?" Lin You asked in a deep voice.

"I think so... I remember last week's anatomy class was about dissecting frogs."

Lin You's heart sank; it seemed she hadn't guessed wrong.

There really are chameleons on the third floor.

Because after the gray fog, many of the strange beasts were somewhat related to creatures similar to those on Earth before.

Lin You didn't know the specific reason, but the presence of chameleons was the only reason for their existence in any given area. The only plausible explanation was the mutation of the plants and animals.

Some people say this is a kind of substitution.

Lin You's face was very grim. "I'm afraid we've really run into trouble."

Qin Ying's pupils contracted, and she asked, "An even bigger problem than those four people?"

Lin You sighed and said, "These are not the same thing at all. The four of them are just a threat, while the creature on the third floor is a deadly danger."

"What's there?"

Lin You explained, "The Chameleon Frog is a strange beast that can't be detected even when it's right in front of you. It has terrifying dynamic capture capabilities and a tongue that can flick out at bullet speed."

"Is it amazing?" This was the question Charlene asked after she realized what was happening.

The question seems rather foolish and meaningless no matter how you look at it.

Although it was foolish, Lin You didn't mind educating them, at least to prevent these four people from losing their lives due to carelessness.

Lin You continued, "As far as I know, it is practically invincible at this stage, except for a few extremely powerful mutants."

A variant species is a more dangerous creature than a beast.

They are neither strange beasts that suddenly appeared, nor are they native to Earth; no one knows where they came from.

But... since they feed on exotic beasts, they certainly wouldn't mind eating the even more delicious humans.

"But wasn't your explanation just about a giant frog? What's so dangerous about that?"

Lin You continued, "What if this frog were the size of a cow and could dodge bullets?"

Everyone fell silent.

Skilled in flawless disguise, possessing terrifying eyesight, bullet-like attack speed, and agile bullet-dodging.

This thing seems really dangerous.

"So what do we do?"

Lin You frowned and thought for a moment, then subconsciously drew the bone dagger from her waist and twirled it in her hand.

This allowed her to quickly come up with a solution, and soon Lin You's tightly furrowed brows relaxed as she said, "Use one tiger to devour another."

The four asked in unison, "Using one tiger to devour another?"

Lin You straightened up from her leaning- against the wall. "The four people at the back door are wolves, and the chameleon on the third floor is a tiger. The wolves want to take advantage of the situation, and the tiger wants to hunt and eat. They are not allies; they are prey and hunter who are unaware of each other's existence."

Qin Ying subconsciously pushed up his glasses, a habit he had when thinking. "How could you let the hunting frog attack those four people? It won't obey your commands."

Lin You smiled. Among these people, Qin Ying was the most skilled at thinking and analyzing, getting straight to the heart of the problem. She was a talent that could be cultivated.

"The hunting frog doesn't need to obey my commands. It hunts using dynamic vision and vibrations. As long as someone makes a sufficiently large movement within its attack range, it will instinctively attack."

Lin You stopped spinning the bone dagger in her hand and drew a horizontal line directly on the lab table.

"This is the third-floor corridor. The hunting frog is in the biology lab on the right, and we're at the stairwell on the left. The four people at the back door are outside the building."

She drew a circle and a cross at each end of the horizontal line.

"If they come in through the back door, go up the stairs, and reach the third-floor stairwell, that's where you'll block the stairwell. You need to use some tactics to make them unconsciously head towards the chameleon frogs."

"But they might not come up," An Yan, the short-haired girl who had been listening quietly, suddenly interjected, arms crossed. "They're guarding the back door, clearly waiting for us to leave before making their move. Why would they risk going into the building?"

Lin You stood up and tucked the bone dagger she had been playing with back into her waistband. "Because we'll let them in."

He then looked at the four thoughtful college students and continued.

"The plan has three steps. The first step is to create a reason for them to come. Wang Tao, make a commotion in the empty room next to the biology lab on the third floor, whether it's knocking on the wall or knocking down empty shelves, make a lot of noise. Those four people coming up will definitely be attracted by the noise and move in your direction."

"The second step is to lure the frog out of its burrow. Muxue, use shotgun shells to bombard the ground in front of the Chameleon Frog's room from the direction of the stairs. It will leave the room and move towards the corridor."

"Leave the rest to me."

"Wait a minute?" Wang Tao interrupted, "Shouldn't they have run away as soon as they heard the gunshots?"

Lin You shook her head. "There are four of them, two rifles, one shotgun, and one grenade launcher—they're well-equipped. This kind of equipment isn't something ordinary survivors can get their hands on after the apocalypse. They were probably members of a security company or shooting club before the apocalypse. The gunfire might scare away some ordinary people, but it definitely wouldn't be them."

What Lin You didn't say was that those people already knew Mu Xue had a gun, yet they dared to come up.

That means they are absolutely certain of victory.

Mu Xue continued, "They'll hear the commotion inside the building, assess our strength, and then choose to attack or leave. That's their most likely option."

Lin You smiled and said, "The probability of it being one of the two choices is very high, right?"

Charlene clapped her hands and said, "Yes. They'll definitely take the stairs when they go upstairs because the elevator is out of power."

Qin Ying stared at the rough map Lin You had carved on the table, then drew a circle at the stairwell. "Once they reach the third-floor stairwell, they'll enter the hunting frog's attack range. The hunting frog was just lured out by Mu Xue and is in its most aggressive state. The first person to appear and move will be hit by its tongue flick."

"And then? Frog killed the first one, and the remaining three will shoot at Frog," An Yan said. "The gunfire will give away their position. We'll take advantage of the chaos to escape through the fire escape and get to the armored vehicle. If there are still pursuers..."

Lin You couldn't help but find it amusing. Didn't these college students know that if you don't kill a snake, you'll be attacked in return?

The only way is to leave all these people here, including that chameleon that's good at hiding.

There won't be any danger next time I come here.

Lin You drew her mantis knife, the tip resting on the fork. "I'll cover the rear. The only problem now is that we need to confirm whether the hunting frog has really taken the bait and started moving. Qin Ying."

Qin Ying looked up and adjusted her glasses.

"I remember you're a mechanical engineering student. Could you make a simple vibration detection device using whatever you can find in the lab?"

"Mineral water bottles. Fill them with water and place them on the ground. If the water surface vibrates, it means a large object is moving." Qin Ying paused, then added, "Just give me two empty bottles."

Lin You took two bottles of mineral water from the side pocket of her backpack and handed them to Qin Ying.

He took the bottles, unscrewed the cap of one of them, brought the bottle opening to his lips, and took a few big gulps.

He handed the other one to Wang Tao, because he knew Wang Tao might have to exert a lot of effort later.

You need to drink plenty of water now.

Looking at the empty mineral water bottle, Qin Ying gently blew on it, and the air made a low, resonant sound at the bottle opening.

Then he put the cap back on, turned the bottle upside down, and placed it on the ground with the opening facing down.

The water sloshed slightly inside the bottle.

"The increased ripples on the water indicate that the ground is vibrating." The water in the bottle reflected the faint glow of a tactical light.

He squatted down to adjust the angle of the bottle and looked up at Lin You.

Qin Ying's eyes were bright, the kind of focused gaze that technical students have when they encounter specific problems.

Lin You frowned and asked, "Why did you put the bottle upside down instead of just placing it on the ground?"

Qin Ying smiled and explained, "This is a little physics tidbit. An inverted bottle acts like an inertial indicator. When the bottle is upside down, the water inside concentrates near the opening due to gravity, forming a thin film between the water surface and the opening, maintained by surface tension. This film is very light, has minimal inertia, and is extremely sensitive to external vibrations. Even the slightest tremor on the ground will cause the film to deform and shake immediately. In an upright bottle, the water sinks to the bottom. The total mass of the water is much greater than the film, and its inertia is also much larger. Slight vibrations are 'absorbed' by the entire bottle of water, and the surface is barely noticeable."

Qin Ying sighed, somewhat regretfully.

"That way we can know in advance if the hunting frog is moving. We can't judge the distance. By the way, Sister Lin, that unseen hunting frog must be quite large, right?"

Lin You nodded. "Eating us wouldn't be a problem."