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How can Fisher's Positive Feedback Loop lead to the evolution of extreme showy male traits?

How can Fisher's Positive Feedback Loop lead to the evolution of extreme showy male traits?
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1. First, we should know what is Fisher's positive feedback loop - It is also called Fisherian runway or runway selection it is sexual selection mechanism proposed by Ronald and Fisher in the account of the evolution of male ornamentation for directional female choices for mating.

2. Females selection for the sexual purpose is decided by the character expressed by the male ornamental male is preferred over the non-ornamental male. And if fitness is the addition to the ornament it has an advantage.

3. If a strong female selects the ornamented male is enough to decide to weaken the natural selection. Then this could lead to runaway selection by positive feedback. This is how Fisher's positive feedback loop lead to the evolution of extremely showy traits.

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