In Harper Lee's To Kill a Mockingbird, in Chapter Six, at whom does Mr. Nathan think he has fired his gun?

In Chapter Six of Harper Lee's novel, To Kill a
Mockingbird, Jem, Dill and an unwilling Scout have crept onto the Radley
property so the boys can look in a window and try to see Boo inside the
house.

Under the cover of darkness, the children creep
through yards and garden and make their way to the Radley house as quietly as possible.
They make sure the gate between the Radley's garden and yard doesn't alert the Radleys.
Dill looks in one window, but sees nothing. Jem climbs up the stairs to look through
another window from the porch, but a squeaky step must alert Mr. Radley. (There is a
shadow on the porch which is probably not Mr. Radley, or he would have yelled at them
right away. We might assume this was Boo. However, seeing the shadow, all three children
bolt out of the yard and off of the property, climbing under the fence that leads into
the school yard.) As the three kids run, they hear the sound of a gunshot. Jem is
running hard, gasping for breaths that sound like sobs. The children are
terrified.

When they have calmed themselves, they casually
appear coming down the street, while the adults in the surrounding houses have come out
to see what the problem is. When the children ask what has happened, they are told that
Mr. Radley shot at a trespasser.

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Mr. Radley shot at a Negro in his collard
patch.

When the children
innocently ask if he hit the man, Miss Stephanie says he did not because he shot into
the air. It seems that the children were especially lucky that he
did, or one of them might have been seriously hurt. All they have
to do now is explain why Jem doesn't have his pants on—as his "britches" lie on the
ground, still attached to the fence they got caught on while the children ran "for their
lives."