A man in yellow shirt and black tights, walked towards the bike, bend over and unscrew the screw.  The man in yellow shirt took out his tools from his pocket, he took off the bike wheel from the bike, pull out a yellow tool, insert it between the rubber and metal, removed the rubber inside the tire, tried to find the hole, took a square cloth, wipe the tire, then put the sticker, he pumped the rubber then put it back in the tire.  The person screw the wheel back to the bike.