Steve, you're on 5hp. I'm thinking Torrent could heal you, BUT if we get her to go to the horseman to use thunderwave instead, chances are our path won't be blocked. Furthermore, you could potentially take cover or do a little healing yourself. The reason i'm mentioning this is mainly because i don't want to make Torrent act in a certain way unless People are ok with that.
If we don't need torrent to heal you, we could get her to nova strike the horse and horseman with a max damage thunderwave. Chances are, the horse at least will fail the save and be knocked back. I'm focused on escape
It would be a waste of a good horse, but still.... Unless someone else wants to shove the guy off so we can use the horse. I don't know. We either kill it or steal it because we won't be able to outrun it.