Fred Schaub, associate state attorney called the 20-year sentence “appropriate.”

“We never thought Stand Your Ground truly applied in this case,” Mr. Schaub said. He added that his office made that assessment after speaking with Mr. Drejka and reviewing the surveillance footage of the incident.

The video shows Mr. Drejka arguing with Ms. Jacobs as she sat with two children in a parked car in a handicapped space. Mr. McGlockton then emerges from the store with the couple’s 5-year-old son.

Mr. McGlockton shoved Mr. Drejka to the ground. While still sitting on the pavement, Mr. Drejka pulls out a gun and points it at Mr. McGlockton, who backs away. Mr. Drejka then shoots him once in the chest , and Mr. McGlockton, clutching the wound, runs back inside the store, where he collapses.

“Once he had pulled the gun out, there was no need for him to fire,” Mr. Schaub said.

Mr. Drejka’s lawyer, Bryant Camareno, requested Thursday that the judge sentence him to even less than the 11-year minimum recommendation, and instead release him on probation. Mr. Camareno said that Mr. Drejka had no prior record and had shown remorse.