that guy is a pain in the ass. I died on him many times before figuring out how to do it. I spread my guys out in a line near the back of the room. I tank him in the middle and use the strafe left or right to get my guys out of the floor spawn. You have to watch close to see it and move your guys pretty fast. Space them out so when you strafe it doesnt move the other guy into the spawn. You should be able to strafe left and right avoiding all this spawns. The deathcoil may screw you up but thats how I do it.