He's silent for a moment -- well, somewhat silent, as he's still counting under his breath -- and then he looks back up at Dean, the irritation evident on his face. If he wasn't stuck counting, he'd probably be a lot less calm at the moment.

Any retort he was going to have, however, is completely useless, since Dean disappears. He'll be sitting there for the next several hours, though, carefully counting out each grain of rice.