I shot him through the window, you have to go through the gate to get to them. Using the sniper rifle works real nice, even if you don't have aimed shots. Took two shots, ended combat, looted the place and walked out.
As far as Bishop's safe goes. I had very low traps and set off the trap while trying to disarm it. Took a few points of damage and landed on my ass, but no-one came to check out the explosion. So I looted safe and walked out with no troubles. 8)