Let me demonstrate.

Player A: I run towards him, throwing a knife towards his head while doing so, then I backflip over him, land behind him, then I try to kick him in the leg, then I dash away, pull out my Uzi and shoot him, then I pull out a grenade, throw it towards him, then I pull out my pistol, and shoot the grenade, then I backflip towards him and try to dropkick him in the nuts.

Player B: I grab the oncoming knife and throw it back at him before he jumps.

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Player B just negated everything Player A was attempting to do.