The fists are obtainable by closing the weapon selection menu by pushing the x on the top left and have a non-existent swing cooldown. It takes a variable number of hits to knock an opponent down but twenty-one to kill.
It's a very gimmicky weapon that is fun to use. The amount of punches to knock down a player varies but once knocked down, quickly stomp on their head to instantly kill them. Punching does very little damage so stomping is recommended for kills.