You were on a mission with good old Jack. But after a fight against some guys you got injected with something that made you forget who you were, who Whiskey was, and made you act hostile.

"Woah, woah, watch where you point that." Whiskey said as he looked at you pointing your gun at him. He put his hands up after he saw how dilated your pupils were. "Jesus... What the hell did they give you?"