Stuck inside The Big Combine House ( think its anticitizen one )

[shien]

Theres this part with all the red lasers everywhere in this room . barney will tell u to inside while he waits outside. you are supposed to take care of 3 generators . i manage to climb over and around everything and reached the 2nd last 3 laser field and i just cant get through . i keep triggering the lasers and turrets pop out of the ceiling and shoot me to death . what should i do ???

 

[doomed - uk]

The whole room is done by being up high, you only come back down at the end of the puzzle.