Another point of annoyance added from her actions. The fact that killing didn’t faze her would have had him jumping in joy, if he felt such things. To have a possible ally that, while appearing young, wouldn’t stop at the same limitation that the Order has. The magic she possessed was beyond anything he had seen or researched. He didn’t spend decades traveling the world to find dark magic that wasn’t stuck in a small section of Hogwarts to feel weak. But she had knowledge that he never found. 