Jack and Jill(ian) seem to be long acquainted with each other. Jillian indicates that she believed he had a crush on her. Jillian on her part seems at least fond of Jack and considers him to be a genius Foolamancer. When the two met in battle both seemed to be deeply affected; seeing Jillian and hearing her speak his name appears to have largely cured Jack of his insanity. Jillian tried to persuade Jack to change sides, but he was regretfully unwilling to do so.