. >>> camera man jeff nichols captures the yellow-orange fireball.gerous chunks of concrete and other debris into the air. >> can you see in the left corner of the screen that this panel of debris just kind of floats down from the sky and hits one gentleman in the back. >> i mooil might smell gas or propane type of smell. it doesn't really amount to anything. this, however, was a different time. >> nichols sets up his camera at what he thinks is a safe distance until he roolz realizeses the utility workers are not actually sure where the leaking gas is coming from. >> there is a hesitation from everyone. just an unknowingness of what was happening, where this gas was coming from. am i in a safe area? >> narrator: despite his uneasiness nichols stays where he is and goes to work. >> i had a close-up shot of the two gentlemen walking out of the building, and all of a sudden you see this flash of light hit them in the face. >> narrator: right in front of his cam rash the street blows sky-high and emergency workers start to scramble. >> there's just this

joining me now jeff bow dine and rachel nichols. lcome to you both. >> thank you. >> thanks. >> jeff, i'm sure you've seen this video a hundred times. when you look at it, what did it look like to you? >> well, i have an opinion of what happened that night. i mean, it's obvious that kevin walk down the track. most drivers have done that in their career, if somebody bumps them and they got out of their car and shake their fist at them, makes a gesture to show their displeasure. that's what kevin was doing and that's where the mistake was made. obviously, it was an illy lit race track, wearing a black uniform and very hard to see under those conditions. >> the other driver did see him though and swerved to avoid him. stewart didn't appear to see him at all. >> well, and that's a problem with that type of car. they have that big wing on top, and so it's hard to see past another car, and when the car in front of tony swerved, all of a sudden kevin was standing there, you know. tony tried to react, to miss kevin, but obviously that wasn't