I've had a very strange battle just now.
I played a warrior and was playing against a druid.
Eventually, he ran out of cards while I still had 3.
His last card was hogger.
3 turns later, I managed to get rid of his hogger and everything else on his board, but my side remained empty as well.
At that point, my HP was 23 and his 13.
Maybe he didn't know the rules of the game, or maybe he wasn't very strong in math, but instead of conceding, he kept using his hero power and attacking me, even though my HP was higher and I took less damage than he did each turn.
So for 3-4 we just kept activating our hero powers (it was unnecessary , but I did it just to be safe) until his inevitable end.
Sometimes I can't understand people. There can't be a more obvious losing position than that, but for some reason he wished to waste his time.