Ryan Tribble prevented his student from further attacking another classmate with a knife at Turlock High School.
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Tribble has been a psychology teacher at the school for the last 17 years. Friday's stabbing happened right next to his classroom.
RELATED: Fight at high school in Turlock turns into stabbing, police say
"I heard, 'hey Mr. Tribble, Mr. Tribble, there's a fight. They're fighting; they're fighting.' I just kind of ran, and I jumped over my railing, and I saw that it was one of my students and another young man," Tribble said.
The victim was stabbed multiple times. They are expected to recover.
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Officers arrested the other student for attempted homicide.
Authorities are still trying to work out what led up to the fight.