I was taking one of my Alliance toons through the Thunder Isle scenarios and have hit a problem on the first one (where you fly over the isle, get hit by lightning, fall down and have to fight through to a sort of mini boss). I get to the guy on the dino mount, and no matter what I do I cant get him deaded. I get the dino's health down, then it resets to full. I do it again, and he resets to full. This happened about 5 times. Am I doing something wrong?
If this is bugged, is there a way to get past it, or do I have to do it to progress?