Grand Healing (Skyrim)

Grand Healing is an expert level Restoration spell which heals everyone close to the caster for 200 points (300 with Regeneration perk). This spell will heal the caster and followers, but will not heal atronaches or thralls. The range seems to be ~10 feet. It should be noted in rare occasions the spell may heal enemies as well. It appears to only happen if the enemy was friendly before. i.e Thalmor patrol before you aggravate them by claiming you worship Talos.

Presumably this is a bug due to hostile flag not being set correctly.