Updated at 7 p.m. Monday with the additional statements from Jack Wilson.
It was a position Jack Wilson said he hoped no one would ever have to be in.
Wilson was one of the congregants who shot and killed a man Sunday after the man opened fire in a church near Fort Worth, Texas. Out of everything that happened, there is one moment Jack Wilson keeps replaying.
"Probably Richard [White] getting shot, and knowing at that point, as the shooter turned toward Tony [Wallace], that this is gonna happen," said Wilson.
The gunman has been identified as 43-year-old Keith Thomas Kinnunen of River Oaks.
Kinnunen shot two people before he was killed in the Sunday morning attack at the West Freeway Church of Christ, said White Settlement police Chief J.P. Bevering.
Both of those congregants later died, according to authorities.
Within six seconds of the gunman displaying his weapon, the shooting was over. Armed congregants rushed to surround the gunman, who had fallen to the floor.
Wilson said he and other church security were watching the gunman before the shooting because he came into the sanctuary wearing "a fake beard and a fake wig." He was also wearing a long coat.
"I don't consider myself a hero at all. I did what I was trained to do," Wilson said of his actions.
He described the moments when the gunman stood up and shot Tony Wallace and Richard White.
"He shot Richard because Richard and I were both drawing our weapons at the same time," Wilson said. "Then he shot Richard and then he shot Tony Wallace."
Wilson said he couldn't shoot back right away because people were starting to stand up.
"About a second later had a clear shot, then I took the shot," Wilson said.
"I'm very sad for the loss of my two friends," said Wilson. "But I don't feel like I killed a human being. I killed evil, and that's how I'm processing it."
On Facebook, he wrote, "I’m thankful to GOD that I have been blessed with the ability and desire to serve him in the role of head of security at the church."
Wilson's Facebook post had hundreds of comments and thousands of shares by Monday morning. He is running for Hood County Precinct 3 Commissioner.
Many have called him a hero, including government leaders. Wilson prefers a different designation.
"A concerned citizen," he said. "A concerned church member, doing what I can to protect the people of the congregation."
Wilson commented, "SIG P229-357 SIG," indicating the type of gun he used Sunday.
That appears to be shorthand for a Sig Sauer pistol, which the company describes as being "trusted by law enforcement professionals for decades."
In early December, Wilson posted an introduction to himself and his campaign on the page, saying he has worked with law enforcement.
In his description, he said he had served as a Hood County Reserve Deputy Sheriff from 1980 to 1986 and is currently a Texas Commission on Law Enforcement Instructor and a Concealed Handgun License/License to Carry Instructor.
One of his campaign tenets is to "ensure the public safety and peaceful resolution of conflicts through the justice system and other public processes" in Hood County.
Married for 51 years, he said he has lived and raised his family in Granbury and Hood County for the past 42 years.
His apparent campaign slogan, created weeks before the shooting took place, was eerily related to Sunday's events.
"Make sure your vote is on target."
In his post thanking the community for its support during this difficult time, Wilson said he would not allow evil to win.
"Evil does exist in this world and I and other members are not going to allow evil to succeed," he wrote.
He also asked his followers to pray for the church's members and their families and thanked those who had already shared their prayers and condolences with him.
"I am very sad in the loss of two dear friends and brothers in CHRIST."