The Club Fight near the end of the film. Just when you think Leeroy is in over his head, all of his students come to the rescue. Not only that, but Johnny and Tai finally get their chance to kick some serious rear against the mooks.
Angela dumping Eddie Arkadian:
Eddie: Where you gonna go, Angela? You're just another dental school drop-out from Kew Gardens getting by... on her tits!
Angela: and in the end Eddie you know what? You’re nothing but a misguided midget asshole with dreams of ruling the world… yeah also from Kew Gardens… and also getting by on my tits…
As Leroy is on the receiving end of a Curb-Stomp Battle, he starts to remember all the times that hinted at his potential of being a true master, which finally enables him to summon The Glow just as Sho'Nuff is about to finish him:
Sho'nuff: Now I'm gonna ask you one more time! Who... is... the master?!