Numbers seems nonchalant about the whole hands touching thing. He forms his right hand into a fist with his thumb pointing slightly out, palm facing forward, then grabs Arthur's wrist to place his hand on his hand.

"This is 'A.' You've gotta make sure you're kind of...holding it up and slightly to side," he explains casually. "Clarity is important--picture it like you're showing these signs to someone across from you. Give it a try."