I did that once and my mare "danced" on me. I think I would have
been better off to let go.
PP
If I have a next time, I'll try to let go,
too. Some years ago, my horse fell with me and I held onto the reins as
I stepped off. However, as the horse got to its feet, he put the weight
of his front foot on the inside of my lower leg and stood up. Nothing
got broken but I ended up with a horrible bruise all the way down my lower
leg. And the horse only went a few feet away and stopped!