A potion's coordinates are linked with my horse's.

Okay, so I was on my horse on a tower, and started throwing a bunch of potions at the ground, as I watch, the potions start to be thrown from behind me, gradually moving back, after a bit, the horse takes damage(Presumably fall damage.). I keep holding down the button. Then, a little bit longer than that, my horse gets set on fire, behind me, on the ground, there is some lava that i placed earlier. I get off my horse, and it teleports near the lava.

Here's  a  screenshot: 

And here's a link to my twitter, where I have two videos about it: https://twitter.com/IfItIsnt881