Woah, sounds spooky.
Hope he's okay! (:
Scariest thing that every happened to me? We were in a lesson, and were riding in the intermediate ring for the day because the intermediate kids wanted to give the advanced ring a try. My friend Amelia was riding a six year old appy named Freddie, and she was rounding a corner. Freddie was very clutzy and his legs totally slid out from under him. He came crashing down to one side and Amelia was thrown off. The first thing I noticed wrong was that when she stood from her fall, instead of going to get Freddie-which she would've done normally, she loved him to death and would probably be scared that he was hurt- she walked off in the other directoin. So 1) she had no idea what happened/where she was, or 2) she was hurt too bad to be thinking about her horse. Our instructor told her she could sit down, which she did, but she was about to collaspe, so she said she could lie down, which she did. She didn't try to get up and we were all freaking. Amelia is one of my good friends and I was crying my eyes out, totally freaked. I was so scared I swore I heard ambulence sirens. After what seemed like forever, the beginner instructor/barn director walked into the ring and asked what happened. We started to explain. She asked Amelia if she could sit, and thank god, she said yes. After a minute she stood up, just brushed herself off and asked how Freddie was. I was in awe but so happy.. Amelia got back on but Freddie was lame so she just walked him out for the lesson bareback. It was SO scary but she was fine.. thankfully.