Because from other posts the OP has made, it is likely the horse would not being ridden 'up' to the bridle at this point. Also to mention that I have seen very few horses running through the bridle and speeding the trot up, that are actually in balance, on their haunches and over their back. Maybe they were being ridde in this manner and something goes wrong for a moment, but a rider should be able to regain hasty control if that were the case.
My own horse is competing elementary with scores in the 60s, training medium including half steps and working pirouettes, and I still have issues with him barging through my hand when the work gets a bit harder. EVERY time it is becausehe dives onto his front legs, loses balance so takes off. It's a mild correction now due to his training level, a couple of half halts to snap him back again, and ride him up in shoulder fore through some of the work to improve flexibility and weight carriage on the haunches. If I were to start pulling him around in little circles and 'get after him' I can guarantee the proverbial 'manure' would hit the fan. We need to tell a horsewhat to do, not what NOTto do.
It is both a mental AND physical issue, a horse on the fore hand feels that it's rider is not 'leading' and thus needs to balance itself.
Through riding thousands if transitions, teaching leg yield and starting to shift the focus from 'don't run' to a more positive area of 'do this instead', the OP's horse will begin to shift more weight onto the haunches and gain confidence in being able to remain in balance without running.
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Last edited by Kayty; 03-16-2013 at 06:40 PM.