Did Austin Miller just See Steam?

[John Corbett]

Thank you. Was there as break in this steam line at 12:30p that blew a puff of air?
..and it smelled like gunpowder?

Senator Ralph Yarborough: Riding in the motorcade behind Vice President Lyndon Johnson, Senator Yarborough stated, "I smelled the gunpowder…. It clung to the car nearly all the way to the hospital".

Dave Powers and Kenneth O'Donnell: These Kennedy aides were in the motorcade and reported smelling gunpowder at street level near the rail yards.

Other Witnesses: Reports indicate that as many as 13 witnesses near the street, specifically around the Grassy Knoll and Triple Underpass, reported smelling gunpowder, which some interpreted as evidence of a shooter at street level.

Earle V. Brown: A Dallas police officer stationed on the Texas and Pacific Railroad overpass reported smelling gun smoke as the limousine passed beneath him.

Smelling gunpowder is not an indication of where the gunshots came from. Unless someone wants to argue that the shots were actually fired by someone on Elm St., we can conclude that the smell of gunpowder had traveled some distance from the source of the gunfire. That doesn't establish where the shots were fired from. Fortunately, we have ample evidence of for that. The shots were fired from the southeast corner window of the 6th floor of the Texas School Book Depository. There is no credible evidence of any shots fired from any other location.

[Michael Capasse]

Smelling gunpowder is not an indication of where the gunshots came from. Unless someone wants to argue that the shots were actually fired by someone on Elm St., we can conclude that the smell of gunpowder had traveled some distance from the source of the gunfire. That doesn't establish where the shots were fired from. Fortunately, we have ample evidence of for that. The shots were fired from the southeast corner window of the 6th floor of the Texas School Book Depository. There is no credible evidence of any shots fired from any other location.

  we're talking about the smell of smoke that lingered in the air.
Unlike constant steam in a pressurized pipe that would dissipate

[Mitch Todd]

we're talking about the smell of smoke that lingered in the air.
Unlike constant steam in a pressurized pipe that would dissipate

Because when a gun fires, the smoke lingers in the same spot for hours, even days. Sometimes years! 

[Michael Capasse]

Because when a gun fires, the smoke lingers in the same spot for hours, even days. Sometimes years! 

Who said that?
How do u see steam from a pressurized pipeline?

[Fred Litwin]

Actually, S. M. Holland said the smoke lingered...and that is the exact word he used...

[Tom Graves]

Starting At Video Time 1.24

Is it true, as Comrade Lane says near the end of the clip, that "The vast majority of witnesses who expressed an opinion as to the origin of the shots agreed with Mr. Holland that the shot did come from behind the fence"?

[Mitch Todd]

Who said that?
How do u see steam from a pressurized pipeline?

I'm being sarcastic. In my own experience, gunsmoke (which is mostly steam, anyway) dissipates almost instantaneously.