I was walking through Freeside, on my way to the Strip, when Rex ran past me. I had long since sent him back to the Lucky 38, so he shouldn't have been out. Now, whenever I try to re-enter the Lucky 38 Rex runs through the casino and into the elevator and then the sentry robots attack me. Has anyone else had this happen to them? Is my only recourse to fight my way to the Presidential Suite so I can get my companions/gear?