The butterfly entered the house and did the only thing it knew how to do. The creature spread the poison throughout the house, tainting everything with the deadly powder
When the neighbor arrived home with his wife and kids, the air tasted different, almost stale. Over time, however, the family became increasingly ill. It wasn't long before the entire family had passed.
No one can say whether Erin relished in his victory or not, some even say that his neighbor's ghost haunted him until he died of guilt.