After guiding Taylor, Kellen then was given a cane to assist him with walking throughout the day. Taylor confirmed that he was capable of doing so, but he had to rely on the cane. She even made him walk up and down the hallway, watching his muscles and bones move as he did so, and yelled at him when he wasn't relying on the cane enough.
This soothed the on edge Captain to watch Taylor test him. It was only after he'd asked as many questions about Kellen's health that she would allow, that he finally calmed down. Kellen could tell that he was getting on her nerves, but couldn't help but find it endearing that he was so worried.
His parents did worry for him, but not like this. Not like the world wouldn't be right if something was wrong with him. So Kellen couldn't be too harsh on him, even if Taylor was a few steps away from losing her mind.
Next chapter is Kellen using 'that'.