Lorna looked up. It actually did take a bit of constant attention to keep it up. The metal, though it could hold a magnetic charge generally wouldn't for long, especially if jostled around a lot. Besides, she could sense the blood on the other side, and the movement of the metal.
She grimaced. This box had been empty! If someone really wanted to get their seat they could have had the good grace to get there on time. (On time was early, as her Mom was fond of saying.) Doing her best to not make a sound, she toed over and redid the 'lock.' Accidentally using about the force you would get out of an electromagnet meant to pick up cars.