What does Jem tell Scout about ''that night'' at Boo Radley's house in To Kill a Mockingbird?

In Harper Lee's To Kill a
Mockingbird, in Chapter Six, Jem, Scout and Dill almost get caught
trespassing on the Radley property. As they run away, Mr. Radley fires a gun into the
air, and the children believe they are running as if their lives depended on it. They go
under a fence that borders with the school yard, but Jem's pants get caught and he has
to leave them there. There is no time to untangle them because they are worried that
they are being pursued.

When the kids return home, excuses
are made to the adults about Jem's missing pants, as everyone stand around discussing
the "excitement" at the Radley place. When Jem and Scout go to bed that night, Jem tell
Scout he must go back after the pants. Scout is frightened for him,
especially because of Mr. Radley's gun; she even threatens to tell Atticus, but Jem
explains that is has been a long time since he got in trouble with Atticus, and he
doesn't want that to change. So Scout nervously waits at home until Jem returns with the
pants and silently goes to bed.

In Chapter Seven, Jem tells
Scout the circumstances surrounding his retrieval of the pants: when Jem got there, the
pants were folded neatly on the fence, and the tear had been mended, as if a child had
sewn the torn fabric back together.

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'...they were folded across the fence...like they
were expectin' me.'

The
entire incident troubles Jem, and he shudders as he tells his sister, wondering who
could have known he would be coming back for the trousers.