Boxing is not meant for killing each other

I did Watch Pacquiao vs. Margarito fight

I just finished watching the Pacquiao vs. Margarito fight.
I was wondering about the health status of Manny Pacquiao because as far as I know he was not a 100% healthy trained aside from the fact that he loosed weight. But still he retained his speed and stamina.
There are things that I learned in this fight Pacquiao vs. Margarito:
Boxing is not meant for killing each other
" Manny Pacquaio does not need him ( Mayweather ).