I started playing through the ladder on beginner just to get the alternate costumes. I started playing with Jade, and when I got to Goro I started playing around and he beat me, then he did a fatality.
Has anyone else seen this or the other boss' fatalities.
I don't know if it's coincidence or something that matters, but they seem way more likely, in my experience, to do their fatality if they aren't close to you after the hit that ends the match.
If their last hit sends you across the screen or more than a jump away, they seem way more likely to do the fatality.
Again, could just be coincidence, but that's what I've observed.