A different way to heal

[Forward]

You don't need shielder to corner, it's a myth. You need 1 skilled person to block Odin with any melee weapon, constant heal and constant stun lock.

But let's stop off-topic if you want to talk about your idea. I think it should be not archer nor crossbowman to do that, but peltast.
Let's say he got syringes as support item and throw them to friends.