Yep, I went from neck reining to direct reining and had to pull to the left to get SL straightened last week. I've got a lesson Sun afternoon. I really want to go back over what I did with her. Maybe it had something to do with the bit. Also I was squeezing with my legs to get her moving. I really want to rule out if she was spooked or just throwing a fit. Eddie said she continued to buck a few more times after I was off.
Well, like I said before, I'd go with she was throwing a fit, and I would not be neck reining that horse. You'd have too much slack to gather up if she broke in two again. I'd put her in a bit that can get her shut down quick, and I'd be holding the reins where I would make contact with just the slight pull on the reins. A bit won't make a horse buck if it's bothereing them. If the bit is a problem they will most likely start tossing their head up and down.
Becky