I think I know what you mean...??

There was an article last year in STS about what can happen when you try to power your drift setup out of a tree. The guy ended up with some weird swelling in his hand after the wad shot straight back at him when it came loose. It wasn't until they X-rayed it that they figured out the swivel had penetrated his skin, busted off the main line, and lodged itself against the bone.

Criminy, I just cut it off now, it's not worth it!