Stegodeus v Stegoceratops speed

I open with stegoceratops (speed 110), he opens with stegodeus (speed 107), I hit with slowing impact (50% reduction X 3 turns), he hits with superiority strike (33% reduction X 1 turn)
He immediately has priority. No immunity, damage was correct for SS.

Superiority Strike cleanses the speed debuff, so Stegoeus went first in the next turn.


Makes sense.