GEOFF BENNETT: There's a new interview today with the first detailed comments from the man who stopped a school shooter in Bend, Oregon, one week ago.

Three students and a teacher were killed before the suspect was shot and killed by a father who has children of his own at the Silver Rail Elementary School.

That man is Kaylub Giamanco, who is a carpenter.

He told our colleagues at Oregon Public Broadcasting in this exclusive interview that he was heading home for lunch and driving by the school when he saw the shooter carrying a shotgun.

KAYLUB GIAMANCO, Stopped School Gunman: And then I proceeded into the parking lot, and I saw him walking all the way across the school, and I just was in full panic.

Like, no, there's children, there's babies in there.

And I told my Siri to call 911.

And the dispatch had picked up.

And I was reporting the incident.

But she was asking questions that they frustrated me, and I understand there's protocol, but she was asking me, do I know the person, all these things.

And I said: "I'm sorry.

I have to go in.

People are going to die."

And then I peeked through the window, and, at this point, I found my opportunity, and I seen a teacher on the left struggling with the gunman on the right with the rifle.

And I knew that they were -- they were both side to me, and I knew that he did not know that I was there.

And so at that point, I swung the door out and open, and I stepped in and I fired.

And they dropped to the ground, and the teacher sprang out of the building, thinking that I was a second shooter, and I could see the fear in her eyes, and that did hurt a lot.

But I could see the fear in her eyes.

She left the room, and this happens in seconds.

And then I looked down at the gunman, and he was scrambling for his weapon.

And I looked at him and I shot him two more times to make sure that he couldn't move, because I was afraid of him shooting anybody else.

GEOFF BENNETT: Giamanco also spoke of how he felt after he took down the shooter and of that day's larger tragedy.

KAYLUB GIAMANCO: Felt like I was having a heart attack almost the entire time.

I have never had so much chest pain.

I mean, I can't tell you what it feels like to take a life.

It's really not -- that's not how I thought that my Thursday was going to go.

But I can tell you that I genuinely feel like I was supposed to be there.

And if I wasn't there, I just don't know what would have happened.

The teacher that was wrestling with the gun with the gunman, I just -- I want to recognize her.

She gave me the opportunity to make my shot without losing my life.

I saw a clear shot to where I did not have to take her life.

Without her and that little spur-of-the-moment delay, I very much feel like I would have been facing the shooter head on, and we could have both died, or I could have died, and I felt like I was the last line of defense between me and the rest of the children in the school.

I don't know her name.

I would love to know her name.

I would love to give her a hug, because that's a real true hero to not have a weapon and to put yourself in between your babies and a firearm.

It's a lot, you know?

I really did want to speak with the families and the victims and just cry with them and hold them.

I want to apologize for not saving their babies.

That's probably the biggest thing for me right now, because the gratitude for saving people's children is awesome, but there's ones that I didn't save, and that's probably the hardest thing for me right now.

GEOFF BENNETT: Thank you again to our colleagues at Oregon Public Broadcasting for that interview.