Parde, no need to argue.  There is a big difference between a horse that does this once and gets reprimanded right away and never done it again, and one, like the horse we are discussing, that has done it many times.  Some horses are more challenging than others.  This one is down-right dangerous and it would be a much better idea to put the horse in a situation where he may hurt himself, than to put the OP in the hospital.
Aww, come on arguing is fun.

I was only using that one time as an example, some horses are definitely more challenging. Anyway, I agree the horse is dangerous and have already said she probably should get something better suited to her.