"There's a reason Winters didn't take you along," Riku bites back, putting the can down without drinking from it. Turns out for the best, because he can smell it, that pungent, too-sweet aroma of something that's started to spoil. He shoves it aside.

"Not that I blame him," and there's nothing Riku could say that could approach the horrors that Xehanort had visited on Vanitas, but it's still angry, it's still unkind.

He knows better.
He knows this isn't going to help anything.
And he's stronger than this, he shouldn't get sucked in like this and start snarling in some exasperated back and forth with Vanitas.
He could stop this right now.

...Or he could give Vanitas the fight he always seems to be looking for.

"Who'd want to babysit you?"