I had made up this list of witnesses awhile back so seeing as we are discussing smelling gunsmoke
Witnesses to smelling gunpowder at street level:
• Ralph Yarborough was in the car two cars behind the Presidents car and said he smelled gunpowder. He is a war veteran with more than 50 years experience with fire arms. WC Vol VII, pg 439
• Earl Brown, Dallas Police Patrolman – “Heard shot’s and then smelled gunpowder” WC Vol VI, pg 233
• Elizabeth Cabell, wife of Dallas mayor, said “acutely aware of the smell of gunpowder” WC Vol VII, pg 486
• Billy J. Martin, patrolman - “You could smell the gunpowder… you knew he wasn’t far away. When you’re that close, you can smell the powder burning. Why you—you’ve got to be pretty close to them… you could smell the gunpowder… right there in the street.”
• Congressman Ray Roberts, seated next to her, had mentioned it also. Same source as Martin
• Tom C. Dillard, two cars behind the Cabell car, he “. . . very definitely smelled gunpowder when the cars moved up to the corner [of Elm and Houston Streets] Same source as Martin
• Virgie Rackley stood in front of the depository building close to the street. “She recalled that after the second shot, she smelled gun smoke…” same source as Martin
• One newspaper summed it up: “. . . seconds later the cavalcade was gone. The area still reeked with the smell of gunpowder.” Same source as Martin
Witnesses to Hickey holding and possibly firing a “rifle”:
• Dallas Mayor, Earl Cabel. see’s one Secret Service agent standup with a sub-machine gun.
• Senator Yarbrough also saw a rifle.
• Agent Winston rides in the front of JFK in the lead car. He noticed Agent Hickey standing up in the follow up car, “I first thought that he had fired it”.
• Sam Holland, a witness, is standing on top of the underpass as the motorcade is going under him. “After the first shot, the Secret Service agent raised up with a machine gun and dropped back down into the seat. WC Vol XIX, ex 5323, pg 480
• Roy Kellerman testified there was an AR15 in the motorcade.
• Hugh Betner saw one Secret Service agent pull out a gun, he was standing watching the motorcade. vol XXIV, ex 2003, pg 200
• A police officer on the over pass as the motorcade passing under saw an agent swinging around the gun.
• Margaret Chisolm WC vol XIX, ex 5323, pg 472 saw agents stand up and sit back down.
• Jean Hill – Saw JFK grab his chest and fall forward and she thinks she saw men in plain clothes shooting back. WC Vol XXIV, Ex 2003, pg 212
• Ralph Yarborough saw a SS Agent pull out a rifle. WC Vol VII, pg 439