To Carroll, Diallo's movement reminded him of a prior arrest he made where he had to take a gun away from a suspect. Diallo, Carroll told jurors, never spoke once and never told the officers that he lived in the building. Diallo refused to heed repeated police commands by him and McMellon to "stop, show me your hands," according to Carroll.
"We said it clearly," Carroll said. "He just didn't want to listen."
Then, Carroll said, as Diallo began pulling the object out of his right pocket, he thought the West African immigrant was about to shoot McMellon. To save his partner, Carroll said he fired his weapon. He remembered seeing McMellon fly past him and thought that he had been hit by Diallo.
Then, Carroll recalled, the gunfire became very loud, "like a cannon shot," and he thought he saw the muzzle of the object in Diallo's hand flashing.
Because Diallo remained standing during much of the barrage, Carroll said he thought Diallo was wearing a bulletproof vest. Carroll recalled hearing wood splintering. Carroll said he thought Diallo had shot his partner and that the suspect was determined not to go to jail. Carroll said he aimed at Diallo's legs in an attempt to stop him.
When Carroll's gun's 16 rounds were emptied,
he said he reloaded and slowly approached Diallo, who was now floored, with his head propped up against the entrance way. Since Diallo still held the object in his right hand, Carroll said he still perceived him as a danger. Behind him, the officer heard his partners ask McMellon, "Where are you hit? Where are you hit?" [McMellon suffered no gun wounds.]