[@Thundercrash] Good thing the faculty and staff members are investigating the room because something did interfere with it. 

Also how would Minako break it when everything she does has to do with people's senses? The room is hardly breakable. The room has the ability to withstand characters like Lucas and Jess who are physically strong. Those two have the highest possibility of breaking the room, and Lucas was a prime example since things did crack. 

Lucas was brought to a scary low which caused his hidden powers to unleash. I didn't read Minako's powers to be that physical. She is extremely nerve based.