Chris Mintz was in his writing class at Umpqua Community College on October 1 when he heard shouting coming from a classroom connected with his own, he wrote.
Gunshots he said "sounded like firecrackers" rang out as soon as his teacher went to the door of the connected classroom.
Everyone rushed out of the room, but Mintz held the door and made sure no one remained.
He then ran through the library telling everyone to go across campus before heading back to the shooting site.
In the doorway of one classroom was a woman lying in a pool of blood while another woman, also covered in blood, screamed from inside.
As Mintz yelled to a man in the parking lot to get the police, a nearby classroom door opened to reveal the shooter, who opened fire.
Mintz wrote on Facebook,
When the shooter tried to hit Mintz's phone, Mintz told him, "It's my kid's birthday, man," prompting the shooter to aim at the veteran's face.
The shooter went back into the classroom, however, instead of firing.
After lying on the ground for what felt like several days, Mintz heard a brief exchange of gunfire. The exchange ended when the shooter committed suicide.
When a sobbing friend kneeled down next to him, all Mintz could think to say was "It's my son's birthday… please call my son's mom and tell her, I can't pick him up from school today."
Despite being hit in his legs, abdomen, hand and shoulder, Mintz says he is making a speedy recovery.
His post expressed gratitude for the emergency workers and hospital staff, whom he called "the real [heroes]," as well as the tremendous support from the public.
As of this afternoon, a GoFundMe page to pay for Mintz's medical bills raised $810,721 in 17 days.