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.
Well...I think it was food related. He still won't even sniff the dry food, but I was prepping something for tomorrow and he was sitting next to me when Cisco walked up. He pinned Cisco and there was a lot of noise, but best I can tell, that's all there was. And now they're both back to napping.
I guess it's probably OK. But it's not like I can do a lot if they really *did* get into it.