Istredd lets him go once he moves away, wanting him to find his own way of centering. It does not look good though, he is struggling deeply. Lucifer was not wrong when he said Wilhelm was dangerous to himself. Fixing that was going to take time.

"Because the mind and emotions are very powerful, and if they aren't in perfect concert, they can block people. I've been a mage for over sixty years, and I can still get in my own way." Usually because of emotions. They are definitely the worst, and he is so calm and centered in part to try and keep them from messing him up. But he has them, strongly, under the surface. Istredd is much older than he looks, obviously.

"If you truly think you're responsible for what happened, no one can convince you otherwise. You're holding that in your head and heart. But it also only just happened a few months ago. The trauma hasn't faded from most people." Istredd can only imagine how much trauma still hangs over everyone in Free Cities, having witnessed and experienced it firsthand. The aftermath of that attack effects all of the Summoned, but it's to different levels of tragedy and trauma.

"Give yourself time. Whether it seems obvious to you now or not, the fire manipulation we're working on will help you. The stronger your mind is with magic in general, the better your reaction time will be."