I was running around at the door AoEing together with my brother.. we were trying to stop them from planting the bomb and then suddenly my brother goes "uh, where did you go?" on teamspeak and I get a loading screen then all of a sudden am at the char screen and when I login again I'm no longer in the BG. He noticed me disappearing earlier than I did on my screen, like 0.5 seconds after he said that I got kicked to the char screen.
If you get kicked out from a warzone you don't get kicked to char selection screen.. you get kicked out from the warzone.
Didn't have any companion on any mission.
edit: What is this? My brother just finished the BG and it claims I'm still in the BG. Oh lawd, I got the commendations for my medals when the BG ended. I think bug perhaps.