To answer your questions, it's lag, lag death. Whenever you rubberband, even the slightest rubberband, and you are inside O2's room or even a bit farther out of the entrance hallway, YOU WILL DIE. I cannot explain it concretely but I had so many death experiences like yours to arrive at this conclusion.
It could be that the client tells the server that you went head on with Oryx and ate all the shots.