If he has torpor, whatever, he can heal himself.
If he doesn't have torpor, he should be managing his own health and ideally not letting it drop below 60%. If he really needs the mana, he should arrange ahead of time to ask for a CH when there are no mobs incoming and canni down to ~20% while you CH.
And yes, he should probably always have symbol/heroism from the cleric and be self buffed if he's slowing.
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