Goku grabbed Uub by the neck and held him up.
"What's wrong Uub? Why aren't you fighting me?"
Uub says, "I..I-I'm sorry...G-Goku. I...guess I can't h-handle the p-p-power of a...Super...Saiyan...Four..."
With this, Uub died.
"Wow, that was lame. I need to fight someone stronger."
Goku re-created the exit to the Hyperbolic Time Chamber.