Great scene. The fence falling was alluding to the fact that when you're growing up, you will eventually learn a lesson in the difference between imagination and reality. That was their moment. They had come of age, especially Smalls.

Remember, you're not brave if you aren't terrified. You do something that has to be done because you are afraid. If you aren't afraid, then it's either something that you don't need to be afraid of, or you're a fool.
Bravery is when you run once more into withering fire because it has to be done.

I concur. In my eyes, this scene is easily one of the most memorable - and perfect - in the movie.
You want something corny? You got it!