He see's Joker struggling with the floatie, but he makes absolutely no offer to help, instead choosing to watch and laugh at him from the sidelines. He has four arms at this point and he still doesn't have the proper wardrobe to accommodate them, so he is shirtless, but the weather's always nice at the carnival so what does it even matter. The only thing it changes is how noticeable the two brands on his back and his fae mark, all of which Joker's seen before.
C
"What are you doing?"