"I was undercover at a club." Don't make him say it was a sex club, the shirt is embarrassing enough by itself, in the stark light of day and out of the Alvin Draper character. To try and avoid further dissection of that, Tim shrugs as if that's enough information on his undercover troubles and latches onto the other conversational track. "Because he's not our Bruce. He's from some other Earth where, apparently, we don't exist. All I could get out of him was that he knows something about us - me and Dick, at least - from visiting other worlds before, and that he'd rather avoid us."