What could these two be bickering about now?

Meet Pumpkin (the short one) and Stewart (the tall one). They've had the same night shift at Queen Triana’s castle (9th and 10th position on the South-Western wall) for ages now and have grown to be quite good friends. They seem to like spending most of their time together arguing about the most trivial issues. This time, it looks like Pumpkin is laughing at Stewart's shorts… I’m not sure why though…