The tank lb is good on Coil turn 1 if you don't pop slimes in phase 2 if you don't have a melee to use melee lb. Once the splits get to 4 stacks, your tanks can get trucked pretty hard. It's a good damage mitigation cooldown since the splits seem to be too far away to take advantage of the aoe limit break.

Of course, maybe I'm just saying that since it's the only true damage mitigation cooldown a warrior has especially when Virus is not on the boss.