I managed to do it the first time but it was not easy. I went there not expecting what was about to happen and I was determined to finish it. The Hinox was the toughest part. I tried various things like using bomb barrels (which did almost no damage) and getting it struck by lightning (which also did very little damage to my complete surprise). I managed to find stuff to make an attack power meal and extra hearts for a little advantage, and beat him the old fashioned way like that.