Zack is just not that sophisticated. Abe did freak, and when he thinks more about it, Zack might understand it was ... well, at least a reminder, calling card, whatever. But his head is too thick with pain at the moment to mull anything over.

He does wonder what's good though, that Alec thinks Abe is abusive, or that Alec hasn't threatened Abe.

It doesn't matter. Once Zack sees the blade, Karan will get the whale-eyes. It is a disturbing blade, and nice people don't usually pull out something like that, even to only clean their nails.. especially not to just clean their nails. Zack may not have the first clue about what motivates nice people, but he knows enough about demon behaviour to know when something is wrong and creepy, and... sitting forward a little, Zack's left hand goes to the hilt of demon blade at his back, under his jacket. It sits in a sheath upside-down, so he can pull it with ease.

He's not about to attack the bloke, but Zack is quick and keen. He can defend himself, so he believes. And if Alec is not fond of Karan, there's got to be a reason.

"Some," he says, tight-lipped and even more tightly-wound now. "Moves the pain." Well, it gives him a different focus, but he's not really thought about it much. He just does it.