User blog comment:AK151/RWBY Villain Speculations/@comment-24985448-20140707123356/@comment-16241789-20140707150033

That was one of the things I was planning on detailing, but anyone responsible for a potential death of a potential former teammate of hers in Vale would be responsible by proxy, with the Grimm being the primary antagonist and the main reason behind her motivations.

My thoughts, at least.