Dr. Salvador is tough, because of the paper bag he wears on his head.
It makes him tough because that paper bag is...... ummm.... I don't know man.
Anyway, in order to defeat him, you must use your knife (L2).
The technique is you must tear off the head gear he's wearing,
to make him vulnerable.
Run towards him, aim your knife right at his fece.
Then..... oh yeah...... attack him with it....
After that you'll get to see a SPLENDID cut-scene!!!!!
ENJOY!!!!!!!!!!!!!!!!!!!!!!