Ok so on feb 2 I took my 10 year old neice out to ride one of our horses. My gelding was being a turd and wouldn't let me catch him. To I caught my mom's 15hh paint mare. We brushed her down, saddled her up, and I did something before I was going to help my neice up. Well all of a sudden my mare jerks and looks behind her. She starts jerking pulling and moving our explorer (she was tied to the car as anywhere else there was barbed wire.) Well then she acted like she was so terrified that she streatched and just dropped to her side. Her eyes were rolled downwards and you only saw half an inch to a quarter of an inch of her blue eyes. I couldn't loosen the lead or remove it due to her jerking it so tight. I tried everything (while keeping my neice back away from her) to loosen the lead. Well she tried getting up once when I loosened the saddle and rocked her, but couldn't. I had called my mom to have her rush there to help be, but thank god we were lucky. The owners of the property and a man who is like family to them were there. They ran over to help me get her lead loose so she could get up. They got it loose, I had to leads on and one patted her side near her withers and the friend who's like family grabed one lead, I got the other and we pulled. She got up, eyes so wide, breathing heavy, but completely ok. While waiting for my mom to arive she looked at the place again and spooked a little again, but not nearly as bad. while she was down, she was as still as can be, looked petrified, and breathing heavily. My gelding in the pasture was freaking out in the process. We put her back in the pasture after checking her and calming her down. When that happened she stared hard at the area along with my gelding, but my gelding was snorting (name snorty shorty, snorts when afraid). He kept right at her side and pushed her away from that area. Something really spooked her. I do know I should of tied it where she could get loose, but since we've had her, over a year, we have never seen her spook at anything. Uncomfortable at a bull, but not spook. Please do not bash, I am going to learn to do the releaseable knott incase something like this happens again. A learned mistake, bad one, but a learned one. my question is, has this ever happened with one of yours?