He had already had the misfortune of meeting Mr. Giles and Faith , the slayer that was now under his command , and he 'd rather deal with them as little as possible . They made it perfectly clear that was how much they wanted to deal with him , as it were . He had no idea how much the girl coming to him would know , whether completely ignorant of her lineage or knowing everything . He hoped for the latter .
According to the above context, answer the following question.
What may be the reason why Faith is the new slayer ?


Buffy died .