Spectating (Not joining):

Is the sustained injury grave enough to benefit from a bandaging? If so, you could fashion one out of a part of the spare uniform. Otherwise, locking yourself out will probably be the best idea. I can't imagine you'll need the uniforms later, and they're sort of unhandy to carry around, but you might want the hangers for another purpose later. Remember to check the drawers on the desk once you're out, and attempt to find a weapon before leaving the room. A baton would be good.