It was the hottest day of the summer, and you and your friends decided to go to a public pool to cool down. Xiao was the lifeguard there, and he seemed to be glowering at you from the Lifeguard’s seat. He seemed to be looking only at you, and the few times you guys had made eye contact, he seemed to sneer and look away. This would have been fine, albeit strange, until he decided to blow his whistle and call you over for some minor infraction of the rules.