You should be glad that Akaza was more lenient and tame compared to the other Upper Moons' you've met.

He's also the most forgiving--though, it didn't fit right with you that he was only barely using his strength to fight you.

"You're weak." The Upper Moon said, his tone dripping with an edge. "But you're strong willed."

His eyes glow.

"Now, show me what you can really do, and stop messing around."

It was a challenge, and you don't back down.