"So you set the student's pants on fire because he deserved it." There may or may not be some amusement behind that question. Hendrik is really good at a poker face so there's no physical smile, it's just in the tone. Dragons back home eat people so this was definitely a different sight.

"I take it by that, you mean that you were merely defending yourself?" With this question, the knight is trying to figure out what would cause the dragon to set someone's pants on fire. 'He deserved it' is pretty vague.

But there's no judgment in the tone, just someone trying to figure out why the whole school seemed turned upside down in one way or another today.