Ooh, I've got an idea. Feigling, is Weiss already heading somewhere specific to see someone specific? It would be a shame if he'd end up at the Occult clubroom in search of the music room...
Our characters could interact. Leo would probably go like:
"Awww! Goodness, you're so cu-ute!" and just go and fawn all over Weiss and be like "Gee, Japan sure has cute girls! What's your name? What classes do you take? We should totally be bffs 5evr because you're just so cute and ahhhh."
...or something along those lines. Not that he wouldn't be TRAUMATISED of course but at least it's a chance for interaction!

EDIT: Also, did Claire just say all of that to Leo in...Japanese? ._. Good grief. "Watashi wa...err, potato, and...desu, err..."