From what Black said, whatever in Godric's Hollow caused Black him to somehow be trapped in another dimension, at least partially, and able to project himself into the material world through the nature of souls. From the sound of it, Harry needed to hit him in both dimensions at once for a wound to be vital. However, this was a half-baked theory at best, from the mouth of a monster, so he had to take it with a grain of salt. Alas, he had no other theory for the man's phasing. Wards only affect people in physical planes, and Sirius could just ignore them, something that should be impossible.
Enchanting Melodies (HP SI)
Book&Literature · athass_prkr
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