It was during Chinese Sleep Chant. You can hear a little of him at the end of my videoMimixxx, those pictures are amazing! Thanks for sharing!
Also, does anyone know which song it was where Guy was singing baritone while Chris was singing falsetto? They sounded amazing, but I don't remember which song it was. I just remember looking at Guy and thinking, "That's Guy's voice!? He needs to do that more often!"