Yeah, the only XP I don't split up when I'm GMing is for pure roleplaying, or for things done strictly solo. The latter hasn't happened yet, IIRC.
(Casting a spell with all your pals around is no more "solo" than rolling a 20 for initiative, and following it with a critical hit that kills the sole bad guy in a fight.)
I'd probably have given the PCs partial XP for that, if they didn't end up having to actually fight 'em later. I'm guessing that Wulf & co. did end up facing those two golems, though.