I'm fairly certain Yuu wouldn't do anyhting but walk on by, look in her general direction, internally insult her in his mind, and keep walking. xD

Lina... Well... She might actually try to interact... :P
Unless she's too busy being Ryuuichi's guide and caretaker, that is.

[b]EDIT:[/b]

Risette might stop too. But only to gently give the galarian a kick in the tuckus for laughs. :P