I have also experienced that about 2 weeks ago. But ya I had forgotten to post this lol. I fought him with a friend and my friend said "WOW, I can't believe it" Then when he went into the battle he said " O:" Because of his health. And his minion/guarder was a couple ranks higher than Munin Mistweaver. Well I thought it was just a prank from KingIsle. My friend had agreed on that one. It's probably a bug rather than a prank. But I think again when Mallistaire had been really tough and a prank so I dont know