It gets better. The only-human Ranma didn't have any idea of this strength before the battle began. It gets better. Ryoga unconsciously hits Ranma's greatest psychological weakness, which drives Ranma to such fury that even the revenge-crazed Ryoga is momentarily taken aback. This is a defining moment for the entire series.
Actions speak louder than words, after all.
Dragonball Z. Look, just shut up. DBZ's fight scenes are interminable and meaningless. They never stop fighting long enough for me to give a damn about any of them.