The human players start on the side during the 10 second at the beginning of the match. When the human players finished placing the stacks on the field, they go back to where they started, and activate the game by stepping on the mat.
Then the human players are allowed to go back to the drivers' station. They should have 15 seconds to do so before the drivers get control of the robot again. So you don't exactly have to leap over the instant the game begin
.