Gov. Tim Walz has spoken before of a shooting last year at a recreation center in St. Paul, Minn., that he said had an impact on his teenage son, Gus. But in the vice-presidential debate with Senator JD Vance of Ohio on Tuesday night, Mr. Walz went further in saying that his son witnessed the shooting, which left one teenager seriously wounded.

On Wednesday, a volleyball coach who played a central role in the response that day described what he, Gus and others experienced in the frightening moments after they had heard gunfire outside.

The coach, David Albornoz, said he ran to investigate, while Gus, a team captain and an assistant coach on a boys’ volleyball team, helped guide young people in the gym to a safe location when many thought a mass shooting was occurring.

“We heard the gunshots,” Mr. Albornoz said. “You hear the screaming. I had no more information than what I gathered.”

The shooting, which was propelled into the national spotlight when Mr. Walz and Mr. Vance discussed how they would address gun violence in the country, was widely reported in St. Paul at the time. It took place in January 2023 outside the Jimmy Lee Recreation Center, part of the Oxford Community Center, one of the largest and busiest facilities in the city’s parks and recreation system. It is also across the street from Central High School, where Gus is a student.

According to several court documents, the 16-year-old victim, JuVaughn Turner, and some of his friends were outside when a young woman got into a dispute with an employee at the recreation center, Exavir Binford.

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