Desmond saw the earphones lying on Marshall's desk, but didn't see him anywhere near it.  Then, a small speck was making a run for the door.  "Damn, that kid runs fast!" he thinks as he chases after it.  He then knelt down, pinched his forfinger and thumb around the back of Marshall's shirt so not to hurt him, and placed him in his open palm.  "Gotcha'!" Desmond exclaimed, proudly.