The biggest factor for failure in this fight is animation lock and sometimes lag. If you're grouping with people that have a clue what they're doing, it shouldn't be that hard. It comes down to luck most of the time. My LS doesn't farm this 6 days a week or anything like that, but I've personally been a part of about 20 some odd kills and I don't think a hard fight. I'm a tank and usually the only time I get cheesed is due to an ill-timed ability right when he puts a plume under me, and even then that's mostly my fault because you can anticipate when he's going to do an ability. But yeah..it'd be nice if you could actually move as you're using an ability.