Sherlock was making himself look like he was breathing. He could breathe, if he wanted to. He made his human like body to have all of the normal organs that a human would have, but of course he didn't need them.

But that actually made him catch his breath, that flash of gold. There was still some of Ares, that buggerer, inside of him. Oh course The Fates said that he would, but this was physical proof.

"I... am sorry to hear that." He really was trying to be like a human, a human would feel bad about that, he figured.