Get well soon Rob
I was chatting to a chap who fitted laminate flooring, disc came off and cut through a rad pipe, up through the wall, across the ceiling, back down the other wall and through his leg. A huge mess.
I was flattening welds the other day with a flap disc and nicked my finger but the worst one was when I nicked my thumb knuckle with a pressure washer, didn't hurt but was a right mess.
Usually you can hear a bad disc before it goes.