The knife issue is primarily that the LMB attack with the knife IE the fast attack has a longer ranger then the alt attack that is slower and for some reason has a pitiful range pretty much point blank. The issue is that the zombies alt attack has the same range as the regular fast one while humans don't. Its a bit unfair in my opinion and it screws over my last stand with a knife tactic giving it a 60% chance of failing every time. >>