A swift nod, I explained further, "what I presume Lily Potter did was use her blood and love into the spell. That means both aspects have to be included for the continuation of that spell. There was no love between Petunia Dursley and Harry." I stared directly into his eyes, conviction filling me. "I could tell that was the case from the mere moments I was in their home. Let alone all the stories I have heard from Harry."