I did this fight a couple of weeks back and it was buggy as hell besides having to do the fight more then once like normal he kept resetting on me at below 50%, I had the LoS issue and to cap it all off he would kill kalyio then CC me repeatedly instead of actually attacking me so it took a good hour or more to finally get him down. I was so angry at the end it kind of messed up chapter 1 for me.