Let's start from basics: Melee attack should work. Knife is simply unnecessary. Also both knifes and melee attack speed is hilariously slow. Just imagine you're a soldier that charges someone in stress into melee attack, and can do single attack per like 2 seconds. NO NO NO. You should swing with <anything in your hands> to kill anybody in a single strike. We're talking about 2-5kg of hardened wood or metal put into muscle in soldier hands times attack force (run).
Doors can kill you after kick, so melee attack should at least stun or kill you after single attack. Please be concise and consistent - you've implemented awesome "stress" that affects how model behaves. Please continue that trend - cause it's awesome.