"So I'm right, check and mate."

That gets a raised eyebrow.

"Hmm?"

"Pretty sure logic does not work that way."

"This isn't logic, this is dialectic: if you can't prove me wrong, I'm right, Q.E.D."

"Dialectic?"

"The study of argumentation and the truth of opinions."

"It usually only works that way if you're talking to a really obnoxious teacher."

"Aha, you have found another flaw of mine: I am an obnoxious teacher."

"Hello, obnoxi– actually no I'm gonna stop there."

He laughs. "Oh no please continue!"

"I think I'm good."

He splashes Anthony.

Who turns his head to avoid it getting in his eyes, and then splashes back.

Okay well Kaede can use his feet to splash Anthony. That is much more efficient at splashing even if every now and then he has to stop because that has caused him to actually swim away.

Anthony keeps using his arms to splash back, then realizes it's probably futile and starts kicking a bit – stopping briefly when he realizes it's a bit exposing, and returning to using his arms again.

Then Kaede will win, won't he?

He will! … Anthony starts coughing, a bit.

He stops and grins. "I win!"

Cough. "… Sure."

"You okay? Should I apply all those resuscitation techniques we learned on you?"

"I think I will live without mouth to mouth." Cough.

"Oh good." Pause. "So now will you say it?"

"Say… it?"

"The thing I started splashing you for not saying!"