"The next thing I know, he's pulling out a gun", said Tuscany "Nui" Giasolli.
Just before 2 p.m. local time on Tuesday, a pair of alleged gunmen, both students at the school, opened fire at the STEM School in Highlands Ranch.
Police in Colorado have one student is dead and eight others are injured following a high school shooting in the state.
Sheriff Tony Spurlock said two suspects are in custody, and they do not believe there are additional suspects.
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What Happened at STEM School Highlands Ranch?
Douglas County Coroner Jill Romann has not officially identified the deceased student, according to Douglas County Sheriff's Office.
The shooting at Highlands Ranch came almost three weeks after neighbouring Littleton marked the grim 20th anniversary of the Columbine school massacre that killed 13 people. Giasolli said his actions allowed the other students to seek shelter under their desks and then eventually escape.
"Kendrick went out as a hero", Mr Bialy said.
Bialy met Castillo freshman year and said the senior was a auto buff and electronics whiz. Erickson is due to appear in court on Wednesday.
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One of the Douglas County sheriff's deputies racing to the classroom reported that the security guard had fired as they arrived, according to the report.
Brendan Bialy was one of several students who subdued one of two shooters who entered STEM School Highlands Ranch in a southern suburb of Denver, Colo., his father and a family attorney have confirmed.
"I heard a gunshot", said Makai Dixon, 8, a second grader who had been training for this moment, with active shooter drills and lockdowns, since he was in kindergarten.
"It's necessary that we do something and give back and just shows we take these people for granted", Hall said.
Some students chanted and others railed against the media and called for remembering Kendrick Castillo, the student killed while trying to stop one of the gunman Tuesday.
"We ask our parents and community members to continue to join us in our vigilance", the district said in a statement.
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