Because after this fight, he's gonna have to donate what's gonna be left of his body to science. But there won't be much. That I can guarantee you.
6 seconds sound clip from the Rocky II movie soundboard.
You can hear this line at 01:02:08.775 in the Blu-ray version of the movie.
Quote context
[...]
- Apollo! Has a site been chosen for the rematch?
- This fight will be held in the Philadelphia Spectrum, 'cause I want this man's hometown to see this.
- Rocky, what do you think about the fight taking place in the Spectrum?
- Well, I'm very happy about that.
- Why?
- Well, it's only about 10 minutes from my house, the Spectrum.
- Southpaw jinx nothing! Last time, I took the fight too lightly, and this man was just plain lucky.
- Lightning fast and hard to catch. No playing, no jiving, just business.
[...]