though he gave it all and kinda "injured" frieza, he say it was "nothing". probably from the reason that even after 20 *kaio ken it didn't land crucial hit more than just several injuries. goku in real pinch and it doesn't seems like frieza was bluffing.
vol26 was fast lol, goku vs frieza is just the best thing happened ever since frieza arc started.
(frieza arc i mean -from the minute frieza come to fight them)