Black Temple Trash mob, Wrathbone Flayer

I've been having a bit of problem with this mob, which is located on the way to Gorefiend. This is the giant skeleton that uses a very large 2 handed sword.

For some reason, this mob just plain acted weird. For our pull, I run up with the pull group, excorcism him, and started my usual round of aggro move. 3 seconds into pulling him to the side of the room, he usually just decided to wondered off and wack someone else. I checked, no one else is even remotely closed to me on aggro on this mob, but he just decided to ignore me somewhat randomly. I usually have to burn a RD to get his attention back to me.

Has anyone have this happening to them?
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Periodic threat wipe. Save your burst threat moves (like exorcism) for when he deaggros you.

My best advice for tanking this mob is to stand next to afk ranged DPS. I consider these guys a situational awareness check on the rest of the raid

As for actual helpful information, the flayer uses the following spell:

http://www.wowhead.com/?spell=39544

We just put 2 tanks on it.

For the rest of the mobs, 2 are sheeped and a warrior tanks 2 casters.
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Just for info, the "ignored" debuff is crap, he "ignores you" but each time consecration ticks he gets back to you so...
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Yeah, you just need to get his attention again after you get the Ignore debuff and he comes right back to you. Anything will do: consecration tick, autoattack, judgement, exorcism, etc.
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Never even realised the ignore thing heh >.>
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The Wrathbone Flayers have a debuff called "Ignored." When it is applied to you, it suspends you from the threat list (similar to being gouged), and all threat you generate in that time is reduced to zero. However, if you hit him, you will reinstate your previous threat; you just can't gain anything past that point until Ignored fades.

Therefore, you want to build burst threat while Ignored is down (~3-4 seconds), and then just do minor actions to regain his attention right after he casts Ignored (another 4 seconds). It's roughly a 7-8 second cycle between the debuff being up and down; just have to be ready to hit him for 10 or so right after he does the shout animation (casting Ignored), and otherwise crank up instant threat while you don't have the debuff.

-Splug
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(Usually) Prot warrior: http://www.wowarmory.com/character-sheet.xml?r=Illidan&n=Splug