Thank you!
Yeah, only so much possible within 4h :P
This was going to be explained in a later bit (but ran out of time), but [SPOILER]
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the killers are not "players". They're supposed to be more like guards, who may or may not have a task to make the whole thing "entertaining" for whomever is organising this. Increasing fear in players to take rash decisions and forgo reason, and all that jazz.