Ohio State student Austin Cool was walking to work Monday morning when he saw two fire trucks and police car near Watts Hall.
Thinking it was a fire drill, he just kept walking.
Then, he heard screaming.
"I saw this black guy with a blue sweater vest kind of thing running at people with what looked like a kitchen knife," Cool told News 5. "I saw him slash someone on the arm. He got someone else on the leg, I think. He fell down in the street."
Cool said he turned around and saw a police officer ordering the suspect to drop the knife.
"He had a gun drawn on the guy and he told him at least twice to put the knife down and when he didn't, he shot him like at least four times," the junior said. "And then, the cops and the fire and the police department started clearing everybody in the area, telling them to get inside."
Cool said he considered taking off his backpack to use it as a weapon if the suspect got close to him, but he was able to run away.
"When it actually happens here, it's a reality check. It can happen anytime, anywhere. I'm just thankful we have the campus police that we do."