He tries to hide who he really is by not using his trademark stance in the ring, but not being a good right handed fighter, he is on the verge of losing. Because of this, Johnnie reveals who he really is, but he still is defeated in the fifth round.
In this situation, Johnnie attempts to conceal his true identity by altering his ring behavior and fighting technique, but his lack of proficiency as a right-handed fighter puts him at risk of being eliminated. Ultimately, Johnnie decides to reveal his genuine self, but he is still defeated in the fifth round.