What is happening in the scene below?

The scene:

Leon. No, nor I neither; but most wonderful that she should so dote on Signior Benedick, whom she hath in all outward behaviours seemed ever to abhor.

Bene. [Aside.] Is ’t possible? Sits the wind in that corner?

Leon. By my trother, my lord, I cannot tell what to think of it but that she loves him with an enraged affection: it is past the infinite of thought.

D. Pedro. May be she doth but counterfeit.

Claud. Faith, like enough.

Leon. O God! counterfeit! There was never counterfeit of passion came so near the life of passion as she discovers it.

D. Pedro. Why, what effects of passion shows she?

Claud. Bait the hook well: this fish will bite.

Leon. What effects, my lord? She will sit you; [To CLAUDIO.] You heard my daughter tell you how.

Claud. She did, indeed.

D. Pedro. How, how, I pray you? You amaze me: I would have thought her spirit had been invincible against all assaults of affection.

Leon. I would have sworn it had, my lord; especially against Benedick.

Bene. [Aside.] I should think this is a gull, but that white-bearded fellow speaks it: knavery cannot, sure, hide itself in such reverence.

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