I did a quick search and didn't see this anywhere else, so here's the issue:

I was fighting Diablo on single player normal, when he sent one of the fireballs at me that turns into a circle of fire on the floor. Normally I'd just run to avoid it, but teleported away as it got near me. Instead of being away from the circle of fire, I ended up standing right in the middle of it, in the spot I teleported to (which was not in the direction the fireball was going). This happened a couple times, to the point where I stopped trying to use teleport altogether to dodge the fireballs.