Stuck in nova 2
I'm on the bridge in the part when the big robot thing jumps up to a roof then a bunch of boxy things on out and attack you. I kill all the boxy things but then nothing happens, and I'm trapped on that section of the bridge cause the way forward is sealed off by one of those blue electric gates. There's nothing left to kill so I canny figure out what im supposed to do. Anyone know?

Turns out I was bugged. I had to restart the level.