I know how easily these accidents can happen. My husband recently had a little incident with a very large tree branch and lived to tell the tale. He was riding in front of me and I spotted this rather large and heavy tree branch at rider level and he and his big mare just kept on plowing towards it. It was like it was happening in slow motion in front of me. I yelled to him to stop and go around it. I couldn't believe he was going to try to break it but it didn't break easily and it fell down on top of him, his horse spooked and scooted forward and he was knocked right off the saddle and fell to the ground. I was horrified. Thankfully, he only got the wind knocked out of him and had a minor injury to his shoulder- nothing broken just a lot of soft tissue injured. Consequently, his normally unflappable horse beelined it straight towards the barn like she had flames licking at her hooves as if to say she wasn't sticking around to see if the tree was going to flatten her too! It's funny now but not at the time.