The news of a tragedy is quickly followed by stories of heroes.
In Murrysville, Pa., today, students at Franklin Regional High School are saying sophomore Nate Scimio was one.
Trinity McCool, a sophomore, told USA TODAY he protected her and another friend as a fellow student rampaged through the school, stabbing and slashing. By the time it was over and the student was in custody, 20 people had been sent to two hospitals.
The two girls, hanging at their lockers before class, had seen what they thought was a fight going on down the hall.
NEW DETAILS: Investigation continues after HS stabbing
Suddenly, chaos and blood.
"The guy next to me was Nate Scimio," Trinity said. "I'm not sure if he already got stabbed."
The student with knives came toward them.
"I don't know if Nate did it on purpose or just instinct," she said. "He took the stab right in his arm and saved my friend and me.
"I'm pretty sure it was his instinct. He didn't want anyone to get hurt.
"He told everybody to run away. I'm pretty sure he pulled the fire alarm."
Nate couldn't be reached. He was in the hospital.
Judging by the selfie he posted on Instagram, he was doing OK.