I could have sworn there was a post where we talk about this level (actually there are several, but I can’t find the one I had in mind) . . . anyway.
In that post I can’t find I think we talked about tryng to keep your hero close to the healer (but not to close) to provide support for your guys as they run for a heal and to head of any sneak attacks from “behind” as it were.
Might this idea be helpful? (move hero closer to village when no enemies)