I have put myself in harm's way for others before. One time I held a door shut because I knew a student had a loaded gun in there, and it was almost time for students to switch classes. How did I know there was a gun? I heard a shot (accidental discharge), opened the door, and picked up a warm shell-casing from the floor.
I felt like a hero that day, but others thought that I was just stupid. I relied on my strong, positive relationship with the student, and I hoped that he wouldn't shoot me.