Bob Kuba says he's no hero, but he's being treated like one at Indian River High School.
On Wednesday, the 25-year veteran teacher very likely prevented a tragedy.
"I just reacted to the situation. I didn't have the time to think. I just reacted to it," said Kuba.
Kuba was getting ready to teach his earth science class when one of his students asked to show the rest of the students something.
According to Kuba, the unidentified student said he had been working on a "conduction" experiment at home and wanted to share it with the class.
Kuba told the boy he could share his experiment at the end of the class.
When the class was coming to a close, the student began to remove a blanket from the "experiment."
"Once he took the blanket off, I saw it was a gun case. I thought it was odd that there was a science experiment in a gun case. Once he opened the gun case, I saw that there was a rifle there. I grabbed the rifle with one hand. I warded him off with the other hand," said Kuba.
Kuba said he had taken a hunter safety course and learned always treat gun like it's loaded.
"I just basically reacted to the situation, made sure I kept the barrel away from the students and I kept him away from the weapon," he said.
Kuba reported the incident, police were called and the school was locked down for about an hour.
"You never think that a kid would bring a rifle to your classroom," he said. "I'm just very thankful that everybody's okay. The students are safe. I'm safe and it turned out to be a good day at Indian River. It could have been a bad day."
Kuba said he had no idea what kind of rifle it was or if it was loaded.
(Officials said Thursday that the rifle was loaded).
He also said he had never had any problems with the boy and had no idea why the teen brought the gun to school.
"It's not like Google. We can't get the answers right away. It's gonna take some time for us to get the answers. There's more questions than answers right now," said Kuba.
Many people would have been shaken up by the events, but Kuba went right back to teaching his next class.
On Thursday, people at the school came up to him and thanked him.
Meanwhile, the school was working to get back to business as usual.
"Generally keep the day as normal as possible, that also contributes to lessening the feeling of anxiety," said district Superintendent Jim Kettrick.
Kettrick met with students and faculty during the first period.
He also met with the 20 or so students from Kuba's earth science class and allowed them to ask questions about what happened.
It's unclear exactly what the 15 year old student planned to do with the rifle, but detectives said he had a detailed plan months in the making and that it included violence.
See our earlier report
See Bob Kuba's entire interview with 7 News reporter Chris Horvatits: