“Then lucky for me you happened to when you did.” He could see Harry deciding to hop through the mirror on purpose to investigate, he definitely seemed like the sort to the professor that would investigate regardless of how smart it was to pop through an unknown portal to check things out. Though after what he’d seen just now, he was pretty sure Harry at least had the ability to back up a confident decision like that.

Is he going to admit he tripped and fell through instead of making the conscious decision? No, not if he doesn’t have to. Instead, he shrugs and pats down his pockets, looking for something that might help once they were sure the building, or part of it, was secure. “Honestly, I’m not entirely sure. An hour or two, maybe?” He hadn’t had a way to track it, and trying to avoid those weird creatures had kept him fairly busy before the full on chase had begun. “Not long enough to have a lead in getting out of here, but long enough to know I’d rather not stick around.”