During the battle against the Clumsy Robot, keep a tab on its HP. If you can get it down to 50 HP or so of its life, have Ness cast a Shield B on himself and Jeff. Afterward, wait for the robot to shoot missiles. The damage will be reflected back and defeat him, propmting the Runaway 5 cutscene. However, as soon as it's done, the second missile will hit Jeff, reflect back, and trigger the cutscene again!
Submitted by Artemis251.