so basically you need to use the cameras to watch the fentarat. he has a kill timer that will go down when you dont watch him and will stay still if you do, basically like chester. and the other guy you need to click on him before he becomes too big and he will kill you immediately if you are in the cameras before/during his attack. (also click on rat or his box in the menu to turn on aggressive mode)
credits: me, myself, and i.