Ok, I'm going to jump in here on this one. I have used hackamores on many horses over the years, and I have never known one to break a nose, nor have I ever heard of it happening. I have seen several horses run right through it however. My own horse, for example, will run through a hack like he had a halter on. I've used mechanical, rubber sleeved chain hacks and rawhide bosals, and some horses take to them and accept them and some don't. I have also ridden horses that did much better in a hackamore than any kind of bit. I don't see them as all that severe unless they are not put on properly, and that is where any problems for horses I have seen have come from. Improper use and adjustment. It is a tool, like a bit, and a person should know how to use any tool before they do. Yes, they take a light hand and I wouldn't put a beginner with one, UNLESS that is what the horse does best in, and he or she is given the proper instruction on how to use it. As for the horse you speak of, I wouldn't jump to any conclusions about the bump on the nose of someone else's horse. Quite frankly, its not your business. Could a hackamore have caused it? It could. Or it could be a birth defect or the horse could have run into any number of things to damage his nose. It makes no difference and all you will do if you accuse someone of using a hack when you know very little about them yourself, is cause sore feelings. I can think of several bits and gags that are much more severe than a hackamore that I would never use. Just one old cowboy's opinion. Happy Trails!