Top warrior healer for normal Lady Inerva isnt a warrior

I was browsing warrior healing logs on normal, when i stumbled upon a “warrior” doing 5.2k HPS. At first glance i thought how?, but when i checked to see how he did it, i saw that it wasn’t a warrior at all. The logs show the warrior icon and shows up on warrior healing logs, even though it is a resto shaman. Log: Warcraft Logs - Combat Analysis for Warcraft