Describe symbolism in Smiles to Go by Jerry Spinelli

In Part II, the image of Will standing at the top of Dead Man's Hill, noteworthy for several reasons. First, it symbolically represents the place Will is at in his life, about to plunge into a metaphoric downhill slide into situations that trigger as much significant fear as the prospect of riding Black Viper down the hill. Second, and in a similarly symbolic way, it evokes Will's experience of staring at death in a way he never has before, now that he's learned that protons are destructible. Third, it foreshadows Tabby's accident, which takes place on the hill.