He has his own bad habits, as well, but there's just something about Barty's 'tongue thing' which sets him (and others, he suspects) on edge. Barty's eyes go a little too wide, his insanity a little too contrived. Antonin thinks he probably does it to get a rise out of people. The obnoxious younger brother, plying for attention by being obnoxious.

"Ki," he echoes, then holds out one large hand. He has no compunctions about being friendly with the filthy Muggles of the world. Just so long as they stay in their place. "Antonin. Been here..."

He trails off, then shrugs. A few days, a week. He's not so sure.