Seems like the mare was being holy hell for vaccines, let alone trying to palpate without stock
My horse is the biggest wuss with needles, and throws a huge fuss. When I had her ultrasounded (for the first time ever), I don't think she even noticed that there was someone all up in her business back there. Ears were pricked forward the entire time and she didn't move a muscle - however, she was in stocks. Sometimes, you just never know how they're going to react.