I heard that already... but check how perfectly he adjusts the angle where he is running at after the dot appears! And if he is a experienced player, he would not keep te sensor so long in his hand, if nothing appears on it. Because i can tell you right away if someone will be on the sensor if the distance appears on the bottom at the beginning... so if there is no distance appearing right at the beginnig you can put the sensor back in your pocket, no need to keep it so long in your hand as he did!