Handsome's eyes drifted away from the younger girl as she attempted to wipe down her clothes. He'd quickly decided he preferred dealing with this Lestrange girl more than his own sister, as Sweetie would have likely both cried and illogically accused him of wrongdoing. Miss Lestrange, at the very least, was attempting to help him decode whatever in Merlin's name had gone on.

The giggle, though, was deeply unsettling. It was high-pitched and amused—definitely a female's—but also echoed through the stoned walls of the bathroom as the he and Miss Lestrange stood there. His gaze immediately snapped back towards the Slytherin, his jaw slightly clenched.

"Seems like the perpetrator either has no control over their own noises or doesn't at all fear the consequences of their actions," he said quietly before  glancing towards where part of the wall had collapsed. "You're good with a wand. You think you could stop them if they tried to flee?" He couldn't really ask a girl to catch them with her bare hands.