Sounds like you ran into a lag spike, Cookie. What happens is that even though, on your screen, you shot the AI, the server didn't get the message that you had done so until after the AI had already shot you. Your client program "predicts" what is happening to keep the game running smooth even if there is a momentary disconnect between you and the server, and then everything updates and catches up when the connection resumes. Unfortunately this happens from time to time in the world of online gaming.
