Playing on PC. I was the "opponent" in this instance.

I was playing Boros, my opponent was playing a Rakdos deck, best of 3. They got Summon: Primal Odin on the field and destroyed my creature, leaving me open. On their next combat, they hit me with Odin with the second stage of the saga active, yet the game gave me the win. Not sure how it happened. I didn't have anything on board aside from lands, and they only had 1 other creature.