He shouldn't laugh. He really shouldn't be laughing at all. That was utterly childish and beneath how a king should behave, even when irritated at one's hard-ass trainer. But considering the age-old, friendly rivalry between the two older men, Cor couldn't help but find it humorous anyway to see Clarus taking such a surprise attack like that.

"Ohhh..." Cor wheezes as he finally gets his chuckling under control. "So...he was being a jackass?" Don't think he hasn't noticed that click, though. That will be addressed soon enough.