Game has stopped progressing with an error in the logs: Enemy did enough damage to kill my last character. Game did not progress. Unable to continue play. Based on the log, It might be an issue removing the fire spray ability from my character, even though that card is not owned by the enemy (it was ducked, stolen and cast on me by them). Is it perhaps listed as a trait instead of a spell effect when placed this way?
I'm guessing that your character died and the fire spray had to return to its owner's deck. Since the owner is already dead, the deck/discard pile doesn't exist for it to return to. Nice catch tho
Further responses should be placed in original bug thread (that I missed when I reported this one): http://www.cardhunter.com/forum/threads/game-lockup-on-passing.1943/