Asshole move of the week: Alien Swarm.
Was playing as Tech in the Elevator level. I briefly welded (just enough to lock) a door shut at the beginning of the level, preventing the other 3 parts of my team from moving on. I proceeded to burn the entire stage and deal with ~200 aliens alone. My team kills one of their own trying to destroy the door, and finally finally breaks through and meets me at the elevator and finds, waiting, a shield bug and a swarm (including parasites). The two fall to the parasites and swarm and I lure the remaining shield bug off the elevator before starting it. I finished the level alone with almost no health but having had a bit of fun.
