He'd been in the process of tapping the door again, ward suspended still at the tip of his claw as he looks for a good place to insert it into the magicks already at work. But he glances over his shoulder when Katsuya asks that.

"Hm? Nothing, really, aside from cancel it. Which would happen either way if something were to destroy this ward or the door it's affixed to. That might feel a little unpleasant, but what doesn't kill you, right?"

Right.