Dumbledore accepts the responsibility: the two of them have entered into a bond. Dumbledore’s condition requires Snape to develop more understanding, more protectiveness, toward James and Harry as well as the person Snape loves: this is a magic spell. Snape has increased the range of his protectiveness because of an interaction with the man who accepted his plea for help. Snape is already more powerful than he was before. Anything. Narcissa came to Snape for the Unbreakable Vow in the same state of absolute desperation, saying there was nothing anymore that she would not do. Snape is pledging
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