A bit on Tanking Halphas as RUN/NIN.
Sanguine Blessing. I was quite worried about this after reading Papesse's post. I was even using Lux Vallation to reduce the amount drained(like it does vs Dread Spikes.)

Turns out it's a non-issue. That should have killed me. 3320 HP drained? Would have one shotted me. But so far as I could tell I only took damage from the initial hit.
So it's not really a drain. More like a converts dmg dealt to HP, with a x20 mod based on the initial hit. The issue there is really just letting the mob heal. Which between Shadows and SS is not too hard to prevent. That was the only HP drain he managed on me.
Does Orcish counterstance give them Haste? Not sure what triggered it, but at one point he just started hitting really fast, and was multihitting a lot. This culminated in me getting flattened by Yarhusta at a bad time.

My cast was interrupted so I should have snapped back into tanking gear and been in 75% PDT for that. And still 2.2k.
For reference Yarhusta takes 3 shadows. Not sure if you get reduced dmg if it takes 1 or 2 and still hits. He only used it twice. 3 shadows ate it the first and I died the second.
Since the drain isn't going to one shot, I have to wonder if I wouldn't have been better off with /BLU, Cocoon, and like BoG Geo wilt. At which point I could probably just spam SS during Sanguine.
The concern there would be one of the moves(Full-on Tackle?) causes Def-, magic def- and I think there was one other erasable. Would need to sacrifice off so Cocoon can be put back up.
Also I saw no signs of hate reset on anything. Mob was glued to me till I died. Even with me spending far more time spamming shadows than any enmity action.