Originally Posted by bbsmfg3
Contrary to popular believe, twisted snaffles are not harsh. With some horses they are the mildest bit you can use. However, you don't stop a horse by mouth pressure, unless you want to create problems, like the one you just found. Teach the horse to stop more with your seat and/or the one rein stop. You probably need to go back to ground work and get the proper whoa(stop).
It could be a tooth problem, but not likely, sounds more like it was an accident just waiting to happen, based on current stopping method.
I disagree that twisted snaffles are not harsh. Its true that for some horses, it may be the right bit, but I think that is more uncommon than common. People usually use a twisted snaffle when they are having a hard time stopping a horse and they do it instead of working on the stop in training. If that is the case here, then I agree with you that it was an "accident just waiting to happen," because eventually, the harsh bit will not be enough or the horse will protest like this one.
I may be wrong about this since I know very little about this breed, but they strike me as sensitive horses. A sensitive horse does not do well with a harsh bit.
I would want to work with him in an arena focused on improving his stop. Every time he even slows down when I cue with seat and hand to stop, I would release pressure until he is stopping on a much lighter cue and gentler bit.