A Ring of Regeneration would have restored his hps in battle. So docked in Air Shield, wielding a good shield, with armor for protection, etc., and just scripted to wait, he would have regained hps.
On the other hand, he would have gotten many afflictions. I think someone once had a Diseased Mictlan Priest get an Infernal Contract early in the game, and had to keep him alive. He was posted into the "most battle afflictions" thread...
