Why is it that whenever it is the other person's fault for the collision, I die? I hardly ever win collisions. What do I need to do to win?
First, you need to throw away the concept of "winning" or "losing" a collision. There is no such thing. There is no way to win a collision - if it happens on your screen, you take damage. If he didn't take any, there was no collision on his screen.
Again, if "both go down" you would start to die from "collisions" that never happened on your screen at all. See the pocs again. Enemy pony flies by at 100' or more distance and *poof* - You have collided! - That would happen when "both go down". Ramming would really work, as it would never fail to hurt you opponent. And the rammed one could hardly dodge what we can't even see.