Snape's worst memory is that he regrets betraying Lily by referring to her hunted status and reinforcing it. That supports the notion that Hermione did a sort of favor for Marietta by preventing her from having the same guilt on her conscience. If Marietta later had to think about her murdered friend Cho and exactly what it was that led Cho to be found and punished, this stopping people from going there is a form of protectiveness without affection.

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