Watch on mute to avoid getting hypnotized by my fan’s sound.
Today I broke Heartstone Battlegrounds causing it to go on godlike-mode to beat me 
What a fun game!
Video Link for youtube: https://www.youtube.com/watch?v=GU3on1qLoUs
That’s because your attack values were so high that the values overflowed, causing the taunt guy’s health to get “reset” back to full. There is indeed such a thing as too much attack.