Sehun was playing with the water 2:35 and Baekhyun was like "wtf are u doing?" And then Sehun split fans with water at 2:38 and this is why he look at the fans and smiled. You can see it on Twitter, the fan upload it. They screamed when Sehun did that and he looked at them with smile.
Oh my god thank you so much for this! I live for fan cams like these!! It just stirs something in my heart getting to see some of the little details that go into their amazing performances like how Kai then lay slyly take their mic pack off as the group performance ends - light turns off and kai hands his pack to soo, xing to Xiumin, and Sehun to Baek before the dance part starts ugh I dunno why little details like that make me so happy ❤️😊😍
From the first they were debut, they were 12 now they are 9, some members left because of their personal reasons. From the beginning those numbers make for easier to recognize them. But each numbers have their own meaning, such as some from their date or year born. You can search more the secret behind the numbers, it quite interesting.