I'm still deciding if he's going to stay in for the night or not. We just had a minor squabble, for no apparent reason, after several hours of them being OK inside together. They're back to sleeping again, but it makes me nervous.
Well, depending on the intensity and if there's just noise or any blood drawn, there's bound to be a ~little~ squabbling while they sort out boundaries. If they settled back down and there was no harm done I wouldn't worry. If you might still worry, you could block him out of the bedroom with a short barrier, like an ad hoc kiddie gate if you were wanted to make a safe haven for Cisco, or the the cats.