Our kill this week featured a phase 1 where Supremus seemed to randomly cycle through all three tanks: we'd get a hateful strike, then he'd melee us for 2-3 seconds, hateful strike the next tank, melee him for 2-3 seconds, rotate to the third tank, etc. We weren't really sure who the MT was the whole time, ended up just calling damage on and rolling with weird damage on all three of us. If hateful strike adds a decent amount of threat, it may have just been that all three of us were fairly close on threat, and the threat boost from hateful pushed us over the 110% mark.
Also, I've been told that throwing rose petals from the Valentine's Day event on Supremus is worth a laugh, and felt I should share that.
-Splug
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(Usually) Prot warrior:
http://www.wowarmory.com/character-sheet.xml?r=Illidan&n=Splug