The crowd was already rushing in to grab both of the bunnygirls, with several of the guys ripping clothes off of them to bind the unconscious girl's wrists and ankles before carrying them both off to one of the private rooms.  The distraction was great enough that no one really noticed the owner enough to help him, and Mikuru was able to catch up to him easily enough as he reached one of the doors to the employee area, slamming it shut before he could open it.