[Isa's mental tone sent Riku's guard up, as well as his irritation, but Riku knew that was probably coming across. Taking a deep, empty breath and a sigh, he exhaled his emotions. He'd never been one to let them get the best of him, and his feelings simmered. His statement wasn't much more than an addendum to what Kairi said.]

It was just speculation, since as Kairi said, you were already deep in darkness.