Khan didn't KO Ortiz in the amateurs, he won by stoppage due to a high points lead in some weird scoring system.
It's not really a weird scoring system When you get such a big points lead especially when they are in the 3rd round? then there is no need to continue... Lol in amatuers they all thought Khan was some young skinny little british ****stani kid who was no threat then he boxed all their heads off.