Looks like a broken spur. You should be able to tell looking at his legs/feet. Spurs get broken, it happens. As long as it's stopped bleeding, he should be fine. You can trim spurs to keep them shorter and prevent them from getting caught on things. It also makes it easier for them to get around. I use large nail clippers on mine, you can also use a dremmel. Just don't cut down into the quick, which you can see inside the piece you have there, that part bleeds and is painful. But when they get long, the quick does not go all the way to the end, you can trim a fair amount off there, just take a little at a time, off. I also blunt the tips of mine, so they have less risk of stabbing a hen with them when mounting.