He didn't care if his body deteriorated from the excessive use of forbidden magic, he wasn't willing to wait around this time. He was going to get her no matter what. She promised him... He will hold her accountable...
Controlling the Captain, the Head Priest, what a waste. He should dream bigger, he intended to control the Emperor, turning him into a puppet to do his bidding.
He sat down to write a letter, but before his quill could touch the paper, he abandoned that idea. For some twisted reason, he didn't want to respond right away.
They say imagination is far scarier than reality. He wanted her to stew in her thoughts and make sure her will to oppose would diminish on its own. It would save him some time.