well, for those who do not know about their relationship, Sasaneki clearly tried kill Shuu, which prevented this was Kanae, but Kanae was responsability of Ui. is easier Ui to be blame, and as shown in the dialog of the image, had investigators on the ground or going to ever ready to kill the ghouls that would fall (Shuu or Kanae).
and on page 8, is another investigator being killed, Ui defended the attack