Every time he's making the marker disappear he's making small movements with lots of energy in them - he's clearly throwing the marker, and he's throwing the marker so that it's path is obscured by his hands. I'm speculating that it lands inside his vest. That must have taken an insane amount of practice.
He's also moving a card from one side of his body to another. Later he's moving a card back the other way. My bet is that his vest has some sort of mechanism for moving cards. He moves very awkwardly while doing it, so he's certainly doing some complicated procedure we can't see. He could of course be throwing the card, deflecting it with the insides of his hands or otherwise creating a very curved path, but that's just barely plausible.
He's also moving a card from one side of his body to another. Later he's moving a card back the other way. My bet is that his vest has some sort of mechanism for moving cards. He moves very awkwardly while doing it, so he's certainly doing some complicated procedure we can't see. He could of course be throwing the card, deflecting it with the insides of his hands or otherwise creating a very curved path, but that's just barely plausible.
Anyway, this guy's Dex score is insane.