Actually, its a patch to one of the first glitches, they use to dive on each other and the one on the bottom would stand and the other would be invincible or something...
i dunno, but it was a patch im pretty sure...
using the best stratergy (run around stage) round 25 solo
with other players you cant do the stratergy properly, but round 28 with another dude
SOLO: PAP'd Galil, PAP'd HK
2 PLYR: PAP'd Ray gun, PAP'd FN FAL (Epc Wn, =])