Okay so I was doing Act 3 Chapter 1 in Gears 3 and at the end part where the boomers shoot through the gate and you have to hold them off till Bernie drops the fuel tank what I think must be a glitch keeps happening.

I'm playing in co-op and about halfway through the fight it says Objective failed all players have died, however both me and my partner are still alive.

Does anyone know why this is happening? We both stay alive but apparently the game thinks we are both dead. This is starting to get real annoying, any help is appreciated thanks.