Can you please analyze the very last sentence of the novel for me?

The last sentence is:

"I'm skimming across the surface of my own history, moving fast, riding the melt beneath the blades, doing loops and spins, and when I take a high leap into the dark and come down thirty years later, I realize it is as Tim trying to save Timmy's life with a story." (O'Brien, 233)

I know it is supposed to be really cathcing and you are supposed to remember it for the rest of your life. I dont get it though! What wow factor was i supposed to catch that i am missing?

Thank you!