Santa Fe, Texas (CNN)At 7:45 Friday morning, Santa Fe High School sophomore Zachary Muehe was checking his cell phone while he waited for art class to start. Other students were chatting.
Santa Fe shooting survivor at vigil: 'All that was going through my head was to get out'
Then, he remembers with absolute clarity, he heard two loud blasts.
Muehe says he turned and saw one of his classmates, junior Dimitrios Pagourtzis, standing there, dressed as usual in his long, dark duster -- apparently the same one that Pagourtzis had posted photos of with an Iron Cross and hammer-and-sickle insignia pinned to it.
He was holding a shotgun.
Muehe stared for a moment in shock.
One of his other classmates -- he wasn't sure which one -- sprawled on the floor. Pagourtzis cradled the shotgun in one hand and lifted a .38 revolver with the other.
"He pointed the revolver at her and shot her," Muehe said.
As the classroom erupted into pandemonium, Muehe jumped up and ran.
"All that was going through my head was to get out," he recalled, recounting, just before a Friday night vigil held down the road from the high school, the moment when a shooting began that claimed the lives of eight students and two teachers, and that left 13 other people wounded.
On Friday morning, Santa Fe High became the site of the 22nd US school shooting in the first 20 weeks of this year. Pagourtzis, 17, was taken into custody and has cooperated with police, Galveston County Magistrate Mark Henry said.
Four weeks earlier, a handful of the 1,400 students at this high school, in a small town southeast of Houston, had taken part in the nationwide April 20 walkout to protest gun violence in schools. Now the violence had come to them.
In the second art classroom next door, freshman Aidan Porras said at the vigil on Friday night, he and the other students heard the three shots.
"Everybody freaked out and ran to the back of the classroom, but the door was locked," he said. "Me and a couple of other people went to the ceramics room," a small space between the Art 1 and Art 2 classrooms. They hid there, behind the heavy door inset with a glass window.
Muehe, too, had run toward the ceramics room, but then veered out into the hallway to the door of the classroom opposite.
"I banged on the door and shouted, 'he has a gun!'" Muehe said. Then he ran out and across campus toward a nearby gas station, where he pulled out his phone and called 911.
The students hiding in the ceramics room heard other shots. Then a blast blew out the glass in the window of the door.