Keep in mind: This is an experiment apocalypse AU with different species and monsters that are either friendly, neutral, and hostile to the human being.

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Cain: I'm the real Cain!

(Fake) Cain: No I'm the real Cain!

Marcel: Who do we shoot?

Brynn: There's only one way to tell...

The real Cain and the fake Cain are nervous who is the shape shifter.

Brynn: What is 7 x 4?

(Fake) Cain: 28!

Brynn took the axe from Marcel and beat the shit out of the fake Cain.

Brynn: Wrong answer.

Marcel: (Brynn, are you fucking stupid!?) What, 7 x 4 is 28.

Brynn: Yea but Cain does that little finger thing.

Cain is counting using his fingers by doing the multiplication of 7 x 4.

Cain: 28!

Cain was surprised as the fake Cain went back to the real form which is a shape shifter.

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INFO FOUND:

Name: UNKNOWN
Serial Number: 0019
Ability: Can shape shift into any person beside them when the others are not looking in order to trick them.
Weakness: Doesn't know fully about the habits of the person they impersonate by someone they know
Status: Some are alive, some are dead
Location: It can be found in the park

They're neutral depending on what situation they're in. It doesn't mean it's fully neutral, nor friendly, nor hostile.

Tip: It's best to ask the two (real and fake) about the question depending on what habit they have (there is 70% chance that the shape shifter will likely to show it's true form while the 30% chance that they'll show their true if they flee or die)