just stab him quickly in the kidney with a switch blade or army knife,the guy has already hit u twice and shown aggression,technically it can be considered self defense.
using physical retaliation just because someone used some racist slurs?u mean this nigger has never been insulted in his whole life?he obviously knows he has the physical size and strength advantage,its like those video where the trained boxer takes down 4 unsuspecting civilians in a argument.