The twist at the end was a bit surprising.

Everyone who ever held and shot a real gun (military personel for example) must realize though, that this would never work in real life.

a) Gunshots make a very distinct and next to unfakable sound
b) Bullets hitting their target also make sounds - especially when its a skull.

b) A Gun pressed to the head is EXTREMLY dangerous, even when it fires a blank - NEVER!!! do that!!!
c) A gun fired in close quarters is extremly loud (they are actually always VERY loud) - without protection you should be deaf for a second or two

There are other points, but those were the first I thought of.

Even if we forget about all of that.
What idiot had the idea to let Cole be welcomed by the one person he must hold responsible for all of this?
Of course he is going to immediately attack him - and it was pretty obvious who would win a fight between those two even without Cole being superhigh on adrenaline...

Any of the people he thought were dead would have been a good idea - so he immediately realizes it was fake.

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It could still have been pretty entertaining if the characters were likeable at all.
Cole is unsympathetic from the getgo, Thomas and Sam seemed to be only in there so it wouldn't be all but one white people - I mean really what purpouse did they serve storywise?
Dash seemed to be reckless and responsible until the twist. (And even more reckless afterwards - but then he at least shared it...)

The only one who was likeable out of all of them was Erin. That was until the twist - people doing shit like that are just plain assholes - sry for the language...
After she "died" I literally was only interested in the ending, since I didn't give a f*** about any of the other characters...