Kaylub Giamanco, the man praised as a hero for fatally shooting a gunman at a school in Bend, Oregon, last week, is speaking out for the first time about the moments leading up to the shooting and how he is grappling with the aftermath.

The 36-year-old carpenter, whose two daughters attend Silver Rail Elementary School, told Oregon Public Broadcasting that it was happenstance that he was passing by the school at that moment. He said he had decided to go home for lunch that day instead of eating the food he had packed.

As he drove by the elementary school, he saw a  man in black  holding a long gun and shooting at a vehicle. At first, he thought it was a prank, but then the shooter threw the gun over the school fence before climbing it.

 That's when panic fled into my brain and that's when I opened my center console and said, 'No. No. No. No,'  Giamanco said in the interview. In the console of his truck was a .40-caliber handgun he rarely used.

He said he grabbed the weapon's magazine from another compartment, drove into the school parking lot and saw the shooter walk across school grounds.

 I just was in full panic, like, 'No, there's children, there's babies in there,'  he recalled.  I told my Siri to call 911.  He said the dispatcher had questions for him, but he didn't stay on the call.

 I said, 'I'm sorry, I have to go in. People are going to die,'  Giamanco said.

He described trying to stay out of sight as he followed the gunman.

 I heard him fire two shots into the doors,  Giamanco said.  That's when I started hearing children pleading for their lives and then I started hearing gunfire and I just started army crawling faster and faster and I told myself this is probably the last thing that I'm ever going to do. 

Giamanco said he crawled in through a broken window, staying on his knees until he reached the special education classroom. He said he saw a teacher struggling with the shooter. He said he swung the door open and fired.

 He (the shooter) was scrambling for his weapon,  Giamanco said.  I looked at him and I shot him two more times to make sure that he couldn't move 
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