Summarize this article in one sentence.
As a rider, your goal is to stay on the horse. However, at some point when you've run into trouble on your horse, you have to decide that you're falling and commit to it. If you feel like your horse is going down, you need to get off it. That means dropping the reins and preparing to tuck and roll so that you can fall safely. As you decide you're going to fall, kick your feet out of the stirrups to start getting away from the horse. If you hold onto the reins as you fall, you may hurt your shoulder or be dragged along the ground. If your horse is falling to one side or the other, move your body the opposite way. Use the place between the horse's shoulder blades to push off with your knuckles. Move upwards, and bring your knee and heel up on the side where the horse is going down. Pull your heel up to your rear if possible so that it doesn't go under the horse. When the horse gets to the ground, use your tuck and roll technique to move away from the horse. Go as far and as fast as possible away from the horse. Even though you're going to tuck and roll, your goal is to land as much on your feet as possible, then go forward into the roll. It's not always possible to go feet first but take the opportunity when you can. Try to relax your body as you fall. Tensing up your muscles will severely limit your body's ability to absorb impact. It may take many falls to learn this habit, but you'll likely have less painful falls when you do. As you fall, pull in your limbs to protect them from the fall. If you put your arms out to break your fall, you may end up with fractures in your wrists and arms. At this point, hopefully your muscle memory will take over and help you keep rolling. As you tuck, try to roll onto the back of your shoulder, then your back. Keep rolling until you're back to your front again. You may need to roll again to get away from the horse. If you don't land feet first, try to take the brunt of the fall on your thigh or the back of your shoulder. Do your best to avoid landing on your neck or straight on your back.

Summary:
Decide to fall off when you need to. Push out away from the direction your horse is falling. Land on your feet if possible. Relax your muscles. Tuck your body as much as you can. Take the brunt of the weight in the roll.