What does Holden first say to the reader about Mr. Antolini?

In Chapter 18 of The Catcher in the
Rye, Holden mentions his former teacher, Mr.
Antolini:

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Anyway, I gave old Jane a buzz again, but her
phone didn't answer, so I had to hang up. Then I had to look through my address book to
see who the hell might be available for the evening. The trouble was, though, my address
book only has about three people in it. Jane, and this man, Mr. Antolini,
that was my teacher at Elkton Hills, and my father's office number. I
keep forgetting to put people's names
in.

Later, in Chapter 22,
Holden mentions him again to Phoebe:

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Old Phoebe didn't say anything for a long time.
Then, when she said something, I got up from the bed then, because what I wanted to do,
I wanted to phone up this guy that was my English teacher at Elkton
Hills, Mr. Antolini. He lived in New York now. He quit Elkton Hills. He
took this job teaching English at
N.Y.U.

And in Chapter 23,
Holden tells the sordid backstory involving James
Castle:

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He was about the best teacher I
ever had, Mr. Antolini. He was a pretty young guy, not much older than my
brother D.B., and you could kid around with him without losing your respect for him. He
was the one that finally picked up that boy that jumped out the window I told you about,
James Castle. Old Mr. Antolini felt his pulse and all, and then he took off his coat and
put it over James Castle and carried him all the way over to the infirmary. He didn't
even give a damn if his coat got all
bloody.

Mr. Antolini has a
chance to rescue Holden, to be a Deus ex Machina ("God out of the
machine": “a plot device or character that rescues a hopeless situation”).  He had
already rescued James Castle (initials "J. C." for "Jesus Christ," a martyr) from the
rubbernecks.  Now, Holden wants Antolini to be his catcher in the rye and rescue him
from suicide or mental breakdown.

Mr. Antollini is very
much like the voice of Salinger: Mr. counter-culture professional.  His advice says that
Holden is “in for a terrible fall”:

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The mark of the immature man is that he wants to
die nobly for a cause, while the mark of the mature man is that he wants to live humbly
for one.

Salinger discredits
Antolini in the end by casting him as possible gay pedophile (no rescuing; no morals).
 So, Salinger uses Antolini as a kind of "red herring," a false-savior in order to show
the alienation of the modern teenager from the adult world.