Funny, I have ridden with a person or two using a bosal and the horse's nose never came back bloody.
Heck, I have a friend who trail rides in a lariat-noseband bosal (which I feel is coarser than rawhide) and her horses have never had so much as a scuff on their nose.
Why do we as horse-forum users even give these crazy teenage videos the time of day? I could hardly get past, her, like YOU-KNOW, like WHAT-EVER way of speaking!
I think most of us, even though we are often humble, have more years working with horses than this girl has even been alive. Not that you can't learn something from a young person. You can always learn from people even if it's simply what not to do. But I don't think we have to get our knickers in a bunch over an immature teenage video.
Do I believe her story of some guy blooding a horse's nose? Probably. It could happen. Do I believe bosals are bad as a result? No way. In the right hands I know they work even if I don't have the education to use one myself.