Goku and Frost in “Unfinished Business”

Goku

(after kicking frost to the ground), your trying to test my power

Frost

I'm not doing so

Goku

I'm eager to see your final form

Frost

how did he know I can could go to my final form

Goku

I fought someone to you, I think you should transform so you wouldn't be defeated without you using your full power