It kinda was and it kinda wasn't. The incident you're referring to (read the spoiler, I'm not gonna spoil it for those who haven't seen/played it) isn't like he just walked in, did it, then walked out for no reason. There WAS a particular reason he did it. Kind of a weaksauce reason, but there was a reason. For the sitch with Gabby, there was ZERO reason. Does he have a dark side with darker impulses? Yes. But he generally does a decent job of reigning them in, and he doesn't (so far) tend to just let loose like that without at least the bare bones of a reason.