what does cecil jacobs do to jem and jean louise after the friday night pageant?

Cecil Jacobs runs out of the bushes to scare them, and definitely succeeds.

Someone leaped at us. “God almighty!” Jem yelled. A circle of light burst in our faces, and Cecil Jacobs jumped in glee behind it.

“Haa-a, gotcha!” he shrieked. “Thought you’d be comin‘ along this way!”

He runs out of the bushes and scares them.

He scares 'em