Saoirse just watched with morbid curiosity as the boy took off the...pieces of seaweed. That must've been pretty uncomfortable, having wet seaweed on your body in this weather. Kid must've been pretty dedicated to this prank. "You're welcome." She just kind of made a face as she tried to consider whether or not to show concern. "Ain't all that...a bit uncomfortable, though? Not to criticize your little prank, but I think there's a better way to do it." Was she talking to this child as if he were an adult? Absolutely. It was needed, in this situation.