Dean didn't touch that. The cat thing, the... too much.
When Jo asked what happened, Dean couldn't do anything but shrug. "I dunno, hon, I wasn't there. Cas found you. I've been looking for you."
He caught the look from Harry, then turned his attention back to Jo. "You were out... I dunno, hunting, maybe? Another hunter was there. Girl named Ellen?"
He was hoping some of this sounded even vaguely familiar. If it didn't, the talk he had with Cas was going to involve a lot more yelling that it would've otherwise. Cas had answers and he'd vanished.