Hee! Just tell him the the 'susceptibility to sunlight' factor is directly proportional to how quickly they want the bad guy vamp to flame out. ;)

As for the breathing, your comment brought the scene from The Yoko Factor to mind where Spike, all dressed in his faux!BDUs (roarrrr) stopped outside of Giles' apartment and started gasping for breath to make it look like he was all breathless from running. Ha!