The first 911 call hit Bend, Oregon, dispatch at 12:59 p.m. on Thursday. Officers arrived at Silver Rail Elementary School at 1:02 p.m. In those three minutes, a 25-year-old teacher named Meghan Lambert threw her cellphone at a gunman and tackled him inside a special-needs classroom. A 36-year-old father named Kaylub Giamanco retrieved a .40-caliber pistol legally secured in his vehicle, entered the school, and shot the attacker dead.

Forty-four rounds remained in the gunman's ammunition supply.

The 16-year-old shooter, a former special-needs student who attended the school, approached Silver Rail from an undeveloped area adjacent to the school, threw a Maverick 88 pump-action 12-gauge shotgun over the fence, and climbed onto the property. He opened fire on a red Toyota pickup truck in the parking lot. The driver confronted him verbally, then fled and called 911. The gunman forced entry through an external set of double doors, firing multiple rounds into the glass panes to get inside.

He turned left. Into the special-needs classroom where he himself had once sat in class.

Bend Police Chief Mike Krantz laid out the sequence at a press conference. "The suspect walked westbound along the south side of the school and forced entry through an external set of double doors. He fired multiple rounds into the glass panes in the doors to gain access to the school." Fifteen rounds were fired inside that classroom. Three children were killed — Rhoam Summer, age 5, identified by family, and two others ages 8 and 11 whose identities have not been released per their families request. Lambert, the teacher who tackled the shooter, was also killed. She was 25.

A seven-year-old student and a 54-year-old teacher were wounded.

Giamanco has two children enrolled at Silver Rail. When he heard gunfire, he went to his vehicle, retrieved his pistol, and entered the building. Krantz described what happened next: "As he made entry through the forced-open doors, he heard shooting and saw a teacher involved in a physical altercation with the suspect. He then went to the classroom where the struggle was underway and fired his weapon, striking the suspect multiple times."

The gunman died at the scene. Krantz said Giamanco's intervention "almost certainly helped prevent more bloodshed." That phrase — "almost certainly" — doing a lot of diplomatic heavy lifting for what is plainly a father who killed the man shooting at children in his kids' school.

The shotgun was reportedly purchased by the gunman's mother. A 16-year-old walked onto school grounds with a weapon someone else bought, targeted the most vulnerable classroom in the building, and fired 15 rounds before anyone with a badge could get there. The first armed response came from a parent in the parking lot.

Oregon Governor Tina Kotek, a Democrat, acknowledged Giamanco at the vigil Thursday night where thousands gathered. "And to the community member who heroically intervened to stop further loss of life, your actions carry a heavy emotional burden, and I just want you to know that my thoughts are with you as well." The word "gun" did not appear in her remarks.