She cut him across the face.

[ Is what he heard. He hadn't been there at the time, originally. ] The mark is such that scarring was obvious. For that he sought revenge on her. [ He was insane, in Kija's eyes. And not really due to the drugs. ] After sending out assassins on a number of occasions to try and kill her, he attempted so himself, but you interfered and took the blow meant for her.