I don't play BF3 as much as the guys in the official thread, but as a Killzone 3 player, the one I can relate to most (and gives me a
every time I watch it) has to be episode 4 "Revive". Nothing like being revived under a barrage of gunfire, only to die a second later - literally. One time, I died twice in less than five seconds after being revived by the same Medic noob; only thought going through my mind was "would you let me die already???!!?!!". Eventually, he was taken out after my second revival, so I got to respawn in a proper place.
