[She flinches briefly at the laugh—hadn't really expected her remark to get a reaction—but then when Valvatorez makes his comment she turns around just a bit to look toward him.]

It's also less time wasted on anything complex, because if you're going to put someone in their place you don't want to give them a chance to stop you.

[Now she turns more-fully.]

Hello, Professor. [She notes the lack of a certain other student, who is probably off terrorizing Professor Bigfoot or something right now.] I don't suppose you'd have anything you'd want to share here?