So I ran Satasha HM the other day with some FC mates and we came across an oddity. We were burning the first boss down without any problem when somewhere around 20% HP he started using some one hit kill attack. The attack didn't have a name and I can't find anything on guide sites mentioning it, has anyone ever seen this? Luckily it only affected one player at a time so after a few attempts we demolished it with sheer DPS but it was still pretty weird.