When Donald dumped the old lady's corpse into the hole in the basement, she moved her legs to adjust them into the hole.
Donald uses a slide action pistol to shoot The Witch through the closet door. When he runs out of ammo, the slide should've locked open, but is clearly shown as closed. Beyond that, he pulls the trigger several times once it's empty and you hear the hammer clicking. Without the slide opening to eject the empty cartridge when it's loaded, the hammer wouldn't cock without him cocking it manually, which he never does.