"I was dug in too deep at that point to do any more but keep going," he complains. His problem would've been solved if he just Wilhelm die in the Nocwich Hunting Grounds but he couldn't by that point. He reacted on instinct, anyway. He didn't have to like the instinct.

Wilhelm sure has Lucifer's attitude problems which could become an issue as his power grows, but he doesn't have Lucifer complete fractured family package. No one has that level of family problems as Lucifer.

Speaking of...

He draws back to get a good look at Istredd's face, giving him a look.

"You did what."

Why. Why did that seem like a good idea, Istredd...

"'Annoyed him a little.' Yeah, Istredd."