With Vegeta ready to enter the fight, Nappa realizes that he has lost, and prepares to attack Gohan and Krillin. Goku uses his Kaioken attack to catch up and subdue Nappa. Goku tells Gohan and Krillin about the Kaioken and states that he must be careful because it may destroy his body. He also tells them that King Kai warned about going higher than 2x Kaioken, because it will likely kill him. Once Vegeta realizes that Nappa is useless, he kills him. Goku tells Gohan and Krillin to leave so he can fight Vegeta without distraction. After moving to a new battleground, Goku realizes that the 2x Kaioken isn't strong enough to defeat Vegeta and decides to break his promise to King Kai and use the 3x Kaioken.