I just finished my first run through of Tiny Tina's wonderlands. I was level 37 brr-zerker/Graveborne Hp burst build. Somehow I managed to achieve a quick kill on the Demon Lord at the start of 2nd phase completely on accident. I wasn't entirely sure how it happened, so curious to anyone who has seen or had this happen to them before.

At the start of 2nd phase I had a shield which shot a lightning bolt on hit with a gunshot and I hit a critical hit. I saw the yellow bar tick down a bit and the game just decided that he was dead?