Where was Tom during the time Atticus faces the mob downtown?in chapter 15

In this chapter, the mob of men from Old Sarum come to
lynch Tom Robinson.  They are convinced that he is guilty of raping Mayella Ewell and
they do not want to wait for anything like a trial.  They are interested in just taking
him and hanging him themselves.

The mob goes to the jail in
downtown Maycomb.  That is where they have their faceoff with Atticus that Scout finally
breaks up.

If they are there to hang Robinson, it makes
sense that he would be inside the jail while they are outside.  That's exactly where he
is.  So Tom is in jail while Atticus faces the mob.

Here's
the proof:

Shadows
became substance as lights revealed solid shapes moving toward the jail door.

Atticus remained where he was. The men hid him from view.

"He in
there, Mr. Finch?" a man said.

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"He is," we heard Atticus answer, "and he's
asleep. Don't wake him up."