I found someone else who gave this description online:
When Evan comes to a gap, you must quickly jump to the other side of the scaffold by clicking with the double arrow cursor. Click with the double arrow on the scaffold to jump to it. Do not jump too early or too late to the other side. You have to keep going over the scaffolding until you are beyond 8 points such that Evan wins the 20 points and surpasses the score of Natasha. If you do not make it after the first run, then you just start over. You will need to keep doing this until the Commissioner announces that Evan is the overall winner of the competition and that he now needs to claim his prize.