In Natural-Selection (HL-modification) the F4 key when pressed, takes you out of the game and into the ReadyRoom, where you can choose to join a team or just jump about. When one team is getting completely wiped out, Some players may call out for the others to "F4!" as a way to end the game early, and sometimes, to deny the opposing team a victory.
they Have Skulks! F4! F4!
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