The horse I posted about me thinking threatening to buck finally did it...my sister and I were riding around in the pasture so the other horse was loose, just following us around.
This is a very dangerous thing to do. No beginner rider should ride in a herd for any reason. Doesn't matter that is seems the best option at this moment, it's still dangerous.
But she fell behind so she cantered past to catch up and the horse I was riding tried to follow her into a canter, so naturally I pulled her back, and that made her decide to buck!
Absolutely normal horse behavior. You shouldn't even be surprised.
got back on. I rode around for a while after that to prove to her that she isn't getting out of work by doing that.
This is quite the only right thing in the whole topic.
I would start swinging the rope from side to side without actually hitting her and she would get going.
The way I see this, it will only desensitize her to the rope, or, worse, teach her to run when something moves. Hit (not hard) her behind your leg if she doesn't move, but don't swing the rope uselessly. In addiction, you don't really want your horse to accelerate every time she sees something moving on her back, in other circumstances it might be you putting on a jacket or waving your hands… not something that you want to mean "move please".
I fell on my head.
I don't know what to do to prevent her from doing that again.
Nothing, I guess. Not riding in a field with other horses would be a start, but a horse that bucks when excited or pissed will do it anyway unless you can prevent it.
First thing is staying on. Don't pull at the reins, just stay on and if you didn't fall already tell the horse to go forward. A horse cannot trot and buck at the same time.
Unfortunately, you ask for something that cannot be done. You cannot have it all: ride this horse in a herd and train her to not buck on your own and not fall ever. It's like you're asking to eat a cake, but you don't want to buy it, and you don't have the right ingredients, and you want to touch the oven with bare hands. You're not going to have the cake, and you could get burns in the attempt.
What you can do:
- accept that this horse sometimes bucks, and focus on staying on & not getting hurt: helmet is mandatory, you can save and buy an australian saddle (the ears should help you staying on), maybe wearing a vest could be a good idea too, and riding in a calm and safe pen without other horses around.
- decide you want a nice & calm horse who doesn't flinch if a bomb explodes between his feet. There is one and only way to have such a horse: buying it.
Don't use the "not enough money" as an excuse. You can decide to sell something (not necessarily the horses), or save in other ways and find the money to take lessons, hire a trainer, buy a saddle, build a little pen where you can ride safely, whatever you prefer.
Or you can decide that you need to keep all you have now, but that this horse (and maybe some of the others?) is not perfectly safe to ride so it's better to just ride the one who's safest and leave alone the others.