She saw that as Knafelc recounted the incident on the tracks, "I could see the light go off, the a-ha moment" when he realized that after he was helped by many people in his past, he was able to finally help someone else in return.

NPR: Philadelphian Jumps On Tracks To Help Fallen Man

"I couldn't read the screen because the way the light was hitting it, all I could see were finger smears, " says the software developer.

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"When I shone the light a little clearer through the hole, where he was, I could see this very animated face, " said Clark.

CNN: An improbable escape