See, Irahl might have gotten away with sitting there and covering up any awkwardness with silence, but Vincent goes and doubts himself in a way that requires Irahl to say something. He could continue to sit in silence if he really wanted to, but that would absolutely seem to be confirming Vincent's worry.

So, he speaks up, even though he does sound like he's still figuring things out as words are leaving his mouth. The alcohol is not helping with the lag.

"No, guess you're right... Just never thought about it. Guess it makes sense though."

He pauses then to scratch the back of his head through his braid, which is a very rare sign of hesitancy from him, before continuing.

"So, that's... the cup of ice. Without water. That's why."