"i believe the correct term is undermine" is wat he would say first.....and it depends on who he's talking to really....like..if it's katana, he'd say something like, "how do i know i can trust you enough TO let you in." and if it's setesh, he'd probably say something like, "you know i want to let you in, but i NEED her. i can;t risk losing her a second time."