Its all well and good to say it shouldn't happen with good training, but sometimes on a young horse there are times when you have to pick up a rein and take a hold, and hold there until the horse finds the correct response. Also in speed events like gaming, polo crosse and campdrafting there will come a time when in the heat of the moment you will pick up on a rein stronger than you do at home.
I deal with both of these situations and I always have a chin strap on my snaffle bits, as do most people I know. The only one who doesn't have one is my older, well trained, semi-retired gelding as it is unlikely it will ever come into use.
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