"I don't want your thanks."

In that phrase alone, she gives away that she did grant him mercy by killing him. Her eyes follow his gaze to his own hand and she instinctively flexes her fingers as well out of watching his own.

"That bloodbath was well known. Why haven't you looked it up? It has my name involved so I thought by now you would have looked up every single thing related to me with your arrival. Is that why you've kept yourself away from me all this time?"