I don't know why the champion is fighting Balboa's fight.

4 seconds sound clip from the Rocky II movie soundboard.

You can hear this line at 01:53:13.629 in the Blu-ray version of the movie.

Quote context

[...]

- What's keeping these two guys up? A tremendous boxing moment.

- Here comes Balboa, but the champion's back with another left.

- Get away from him!

- A right hand! A right hand! It's Creed! Now it's Balboa! Now it's Creed! Now a tremendous left by Rocky.

- They're standing dead in the center of the ring, toe to toe.

- I don't know why the champion is fighting Balboa's fight.

- A tremendous left to the head. A left. A left.

- One! Two!

- Creed will retain the title! If neither gets up, it's a draw, and Creed will win the title automatically!

- Four!

- Get up, man! Get on your feet!

- Five!

[...]