He didn't ask because he didn't want to know. He didn't want to know anything about her. The less he knee about her, the better. Easier to stay focused that way, easier to keep it all business. He tended to get attached, Anne and George were good examples of that, and when he got attached to someone, he screwed it up sooner or later. better to feed and be done with it, and move on to the next victim. That's all his life was now, a series of one victim after the next. At least when he was well fed he didn't think about the, and didn't hear their screams in his head.
They walked in relative silence, and Mitchell attempted to play the fierce protector. he had a role to play, until he could get what he wanted. He just had to figure out how to get her somewhere quiet and secluded so he could rip into her aorta and have his fill.