Catherine had done many things in her life that she had been told would send her to hell, so she wasn't too worried about the fact that she was going to have to murder the former Priest, Michael Connelly.
First though, she needed his help to undo the mess he made and get them back where they belonged. She'd done the time-travel thing once before, with much less infuriating companions, and barely made it back alive.
Then again, the biggest battle might be the one in her own head as she untangles Connelly's story and glimpses of the man she once knew shine through. It doesn't help that he might be the only one who can keep her safe from a very much alive Lett, just beginning his demonic game and arranging the pieces that lead to Catherine's present.