In Much Ado About Nothing, what is Leonato's reaction when Claudio rejects Hero?

The rejection of Hero happens as she and Claudio have come
before the Friar (plus all the characters of the play and the audience) to be married in
Act IV, scene i.  The actual line of accusation is
this:

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Claudio

Not
to be married, not to knit my soul

To an approved
wanton.

To which Leonato at
first tries to appease Claudio by suggesting that if he, Claudio, has been the one to
"de-flower" Hero, then --   But he is cut off by Claudio, who makes it clear that it is
not he that has taken Hero's virginity and that she is "more intemperate" than "those
pamper'd animals/That rage in savage sensuality."

Leonato
then attempts to have Don Pedro speak against this, but, of course, Don Pedro stands
behind Claudio.  Leonato says, "Are these things spoken, or do I but dream?"  And he
"charges" Hero to answer truly who the man was that she "talk'd" with "out at [her]
window" the night before the wedding.  Hero, of course, denies -- truthfully -- talking
with any man.  And, as Claudio and Don Pedro storm out of the wedding, Leonato says,
"Hath no man's dagger here a point for me?"

Once Leonato is
left with his daughter, niece, the Friar and Benedick, he sees that Hero has fallen into
a deathly faint and welcomes it.  He says:

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Death is the fairest cover for her
shame

That may be wish'd
for.

Leonato confirms, with
these words, that he believes the Prince and Claudio over his daughter and that she is
better off dead.  He then has a very long speech about Hero's shame (and his own, since
she is his issue), all based upon the assumption that, since honorable men have accused
her, she must be guilty.

Finally, the Friar and Benedick
(also men) are able to convince Leonato to give Hero's story a chance, and he swears
that, if she has been accused falsely:

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The proudest of them shall well hear of
it.

Time has not yet so dried this blood of
mine,

. . .But they shall find, awak'd in such a
kind,

Both strength of limb and policy of
mind

. . .To quit me of them
throughly.

And from this
point, Leonato is Hero's strongest defender.