(CNN) -- Jon Meis' reported habit of carrying pepper spray may have saved students' lives after a man opened fire at a Seattle college.
The shooter had just wounded three people Thursday, one of whom died. He was reloading his shotgun when Meis, a volunteer security guard, saw an opening.
He doused the gunman with the spray and tackled him to the ground.
Other students at Seattle Pacific University piled on and took the weapon away from suspected shooter Aaron Ybarra, 26, police said.
Officers are convinced the bloodshed at the Christian school would have been worse had Meis and the others not intervened.
A man who said he was close friends with Meis' older brother and sister-and-law described him as "amazingly resourceful."
"I wasn't surprised to see he was the hero -- his resourcefulness, love for others and knowledge of the greater good are what defines him, in my mind," Andrew Van Ness told CNN in an e-mail.
Van Ness said Meis enjoyed playing a campus "humans versus zombies" game organized by the school's Student Union Board, finishing in the top 10 both times the game was held.
On Thursday, Meis appeared shaken, at moments on the verge of tears, when ambulances arrived to tend to the wounded. Medics put him on a stretcher and took him to a hospital to check him over.
Harborview Medical Center spokeswoman Susan Gregg didn't identify Meis by name but said a man believed to be the student hero was thoroughly evaluated and released. He had no injuries, she said.
Police would not give out his name, but one of his friends was quick to point him out to CNN affiliate KOMO and pour out his gratitude.
"I could have been one of these people that was injured or in critical condition," said Meis' friend Patrick Maguire. "A lot of (students) were in that building, and he stopped him in the lobby. He didn't get any farther than that. I'm grateful for him, yeah."
Meis, an engineering student, has a reputation for keeping a low profile, not seeking attention, The Seattle Times reported. He is known as a devout Christian and an excellent student.
Meis' sister told the newspaper that the family wasn't commenting for the moment. But he hasn't been able to dodge the social media limelight, which has plastered his name and photos across the Internet with emphatic kudos.
"Hero" was the common refrain.
"Jon Meis is a hero. I have no words for his courage," user Molli Elizabeth posted to Twitter.
"Jon Meis, You are my hero! Greater love has no one than this: to lay down one's life for one's friends. (Jn 15:13)," Tweeter Shane Bengry posted with reference to a Bible verse.
His longtime roommate Ryan Salgado told The Seattle Times about the pepper spray. He said Meis regularly carries it, just in case.
CNN's Justin Lear and Rick Martin contributed to this report.