He should really know to bring his clothes into the bathroom with him by now.
He staggers back under the forceful assault, his shoulder bumping the wall. Grabbing frantically for the towel as it starts to slip he stares down at this strange little girl with a mixture of confusion and damp embarrassment. "Uh- sorry! I um. Are you OK?" He offers his metal hand to her, still clutching the towel with the other.