Now it makes it clear to others the way he is. Or it should at least.
Seeing Haru waste his talent naturally would piss off someone who won't be able to swim much longer. Hence his advice to Ai.
Or at least that's what I get out of Sousuke. But then I like him. More than Rin. A lot more.
also Mamo-chan's character in Tokyo Ghould is completely creepy & gross!