STORY: "Go. Go to the fire. Stop the action. Stop the activity. Don't let no one get hurt."
Fierro described grabbing the suspect by the armor the gunman was wearing, dragging him down and using the shooter's pistol to beat him late Saturday after five people were killed and at least 17 wounded. The dead included the boyfriend of Fierro's daughter, identified by Colorado Springs police as Raymond Green Vance.
At an earlier news conference, Colorado Springs Mayor John Suthers had identified Fierro as one of "two heroes," along with Thomas James, who "saved a lot of lives" at Club Q in Colorado Springs.
Fierro said many others deserved credit, including a young man who had been dancing with his daughter and dragged her to safety when the shooting started, and a drag performer who kicked the gunman with her high heels as Fierro held him down.
"I'm not a hero," Fierro said. "I'm just some dude."
Officials did not elaborate on the men's actions, and Fierro's comments provided details investigators have not spoken about. Fierro said he was detained for about an hour by police who found him with a pistol in his hand in the confused aftermath of the shooting.
He mourned his daughter's boyfriend, who he said he had known since his daughter was in high school.
"He's a good kid. And I loved him," Fierro said.
The wounded included a couple, close friends of Fierro who have two young children.
"I wish I could have saved everybody in there," Fierro said. "I wish I could have done more."
Fierro and his wife Jess Fierro own a Colorado Springs brewery. Their Atrevida Beer Company was closed on Monday as family members gathered at their home in a quiet Colorado Springs suburb to mourn.