There are plenty of things that it could reasonably be. It could be something as simple as the moon was in a favourable position to cause mischief for witches or it could be that Crowley had accidentally crossed the wrong person. It was hardly unrealistic to think that he might have encouraged another magic user to lash out at him.

"You haven't been doing anything unpleasant here, have you? Upset anyone?" he asks, flicking his gaze over Crowley.

He would like to think not, but he knows that this place can be terribly dull. Crowley isn't the biggest fan of things being dull.

"I—" he begins. There's another suggestion he could make, but all that comes out of his mouth is a low-pitched meow. Immediately, he presses a hand to his lips, eyebrows furrowing.