I have seen that happen before. I was in the shop once when some recure shooters where in shooting there bows. They where always where goofing around and one of them took one of my arrows and shot it at the concrete wall behide are back stop and the arrow came back 20 yards at him and going over his head into the other room and didn't do any thing but blunt the point. I about crapped my pants if that arrow would of hit him. he gave me a funny look and all he could say I ate ever seen a arrow do that before ,holly #%@*#! there are few stuck in the wall too, where a release has gone off and they can't pull them out