It's not that Sylvain wasn't expecting to run into anyone else down here - he hadn't seen anyone in passing, not yet, and he knows he shouldn't be surprised that it's him of all people that he could've bumped into. Maybe a handful of other people, but he's heard enough stories to find it sort of fitting to find Claude in a massive library, also surrounded by books.
The stack in his own arms rivals the pile beside the other, and Sylvain can't help the wry looking smirk that tugs at the corner of his lips.
"Fancy meeting you down here, huh?" He's not exactly surprised, but he could at least let it seem like he was - even if only a little bit, "Didn't think you'd have risked getting wet after all that snow probably soaked you to the bone." It's more teasing, bordering on a playful sounding jab, and Sylvain accentuates that with a wink. Just one, and he shifts away from where he'd basically kicked Claude's chair in his effort to pass him by, turning to place down the ridiculous stack of books in his arms onto the table beside him.
There's an unspoken question of 'do you mind?' as Sylvain pulls a chair out opposite to the shorter man and raises an eyebrow, hesitating in actually sitting, "Find anything worth sharing?"