Student with a shotgun fires up to 20 rounds and is disarmed by the teacher.

How did the teacher do it?

The teacher, Ryan Heber, was struck in the head by a pellet but was not seriously injured and refused treatment, authorities said....

Police said a school supervisor helped Heber distract the assailant. There were no security guards or police immediately on hand to help them: The school's armed police officer was not on duty....

Ryan Heber... said he was fine, but too exhausted to relate his experiences.

Here's a more recent story, saying that the teacher talked to the shooter:

Science teacher Ryan Heber calmly confronted the teenager after he shot and critically wounded a classmate, whom he claimed to authorities had bullied him for more than year at Taft Union High School.

"I don't want to shoot you," the teen gunman told Heber, who convinced the teen gunman to drop his weapon, a high power shotgun.

"This teacher and this counselor stood there face-to-face not knowing if he was going to shoot them," said Kern County Sheriff Donny Youngblood. "They probably expected the worst and hoped for the best, but they gave the students a chance to escape."

IN THE COMMENTS: Lots of questioning of "20 rounds."