Maybe I just remember it different. I recall him just succumbing to the punishment and not getting back up. By Gatti standards, I´d say he quit. ... but what a high bar that is. He was an absolute savage.
Naoya Inoue fought with a broken orbital bone for ten rounds vs Nonito Donaire. Zhilei Zhang fought with liver failure for six rounds. Jin Sasaki has been down and came back to not lose 3x already at age 21.