Some of why he cared was the large unspoken elephant; they had a chance to actually 'talk' and perhaps start the healing process. Whatever else, that kind of closure was important. It was likely part of why she'd sought out Sephiroth, as well--the son she had biologically birthed, but never mothered?

Her reply, and uncertainty, made Vincent raise an eyebrow. Not moving from his perch leaning against the Library wall, lower face still hidden. "If my presence is distasteful..." Honest there, as he would not intrude. As much as he wanted answers, wanted to actually talk and to be certain she was safe--he would not make himself a pest.