I can't see it being as simple as literally salt in the wound, like the boil cure wasn't literally hair of the dog (as it wasn't hair of the bear, BF foliage, Rifty hair etc). It could be Sun Magic related maybe ;o
[ you can't stray from what you are, you're the closest thing to hell i've seen so far ]
[ use of force/magic on him is permitted aside from death/maiming ]