Kellen did his best to not let his worries affect his classes, nor his interactions with others. His students didn't need to know that their fellow trainee Guides were in potential danger. Or, more potential danger.
They were Guides. They were always in danger, especially right now. Kellen had to take some blame for that too.
Before all of this, he had been alone. Then, Brent had come along. He hadn't considered how his actions could affect the others around him because he hadn't really had others around him. It seemed that some part of him had always known that and his actions had reflected that. But now?
Now Kellen was kicking himself internally about how he had painted a target on his back, and thus, had painted a target on anyone who interacted with him backs. It wasn't like everyone didn't know that he had personally trained the Guides coming to the front lines. Everyone knew. Plus, Brent was with them.