If she amputated his arm and saved his life, she could make him... to use Abigail's line... "obligated to her." She will have demonstrated her usefulness, and could play along as a part of his team, to whatever degree SHE wants to.

As I said earlier, I can see Connor wanting vengeance against the Abigail crew. I expect that she'll take the ride with Connor, and somehow come in contact with the Abigail crew. Maybe Travis will show up in the nick of time, and save Alex. I recall them ending their conversation in a rather, or at least a somewhat friendly note.