What goes wrong with the childrens escape plan in chapter 6 and at whom does mrNathan think he has fired his gun in to kill a mockingbird?

In "To Kill a Mockingbird," the children's plan to sneak into the Radley yard to peek through the window gets disrupted when they are caught by Atticus. Mr. Nathan Radley mistakenly believes he has shot at an intruder, when in reality he has aimed at a shadowy figure in the dark, which turns out to be Jem's pants stuck on the fence.