I do...not know how it happened as my eyes were averted slightly as it happened, but somehow a mono dark deck with the owner only having played 1 game, managed to summon a solar shield. and then, a few turns later this happened and everything went utterly wonky, to my advantage as those dragons turned into devourers and a nightfall was played by him....
i read about a computer disconnect issue thing, but it doesn't explain the shield which seemed to come and go...