When I was in London underground today, that was busy time and I was last on board, my iPad was put in a business leather case, when the door close, my brief case was stuck by the doors when the door is closing, then I have to force the door open a bit and get my brief case out. I don't know how is the ipad's resistant to such a pressure, and how may I know my iPad is ok or not? It's functional normally, but I noticed some strip on the screen- but, I had zagg's protector film on it, so I'm not sure the strip are caused by the door stuck pressure or the effect of the film? Could anyone have some suggestions? Thanks a lot!