Because i grouped a Nexus HM and asking if someone wanted the Winter Hats, to get ninja by a fake missclick at the end of the first boss.I did Nexus NM with my Hunter MM, killed the first boss and get it.Not simple because your pet take many damage but if you are full Naxx25, it will be okay.But i suggest to do it with someone else and doing twice, it will be faster at the end than doing it alone.