A "Perfect" Round occurs only when the P1 or P2 defeats the other without losing any health. A "Perfect" Round does not occur when one "Rings Out" the other, as this is rather a one-hit K.O and did not result in fully defeating the foe. A Perfect Round will result in a change of the quote the player says. e.g. Rather than Nightmare saying, "Drown in the cesspool... Of darkness." He would say, "Gather before me, darkness of the abyss!"