It's really a survival mechanism, keeping the McCallum side so separate. Because really? People are uncomfortable with them in general. If they weren't contained it'd be even worse.

He can let out the war and blood at the drop of a hat. Even quicker than that, but until then he keeps it contained.

Don't let it bother you, the man said in a low gravely voice. He could read the phone book and you'd hang onto his every word. They've been balancing the curse for generations. They are the knives of Eire and they know it. Being a prince has made the divide a bit more obvious than the rest of his family because he must be the peace and the violence at the same time.

But that's not what you're here for, is it?

Meanwhile, Kale seems to be fine in the real world, though he's started absently fiddling with a knife. (Why wouldn't he be armed?)