Uh..... it sounds like you know exactly how "this" happens..... When you get hit in the face with a hard object, shit that is made out of metal bends.... its designed to do that... Looks like the mask did its job. I'm not sure how long you have been playing goal for but getting dented cages and having to replace them is part of playing a position where frozen rubber biscuits are ripped at your dome bud. My suggestion is to get a quicker glove hand