i'm the one that did it. will you let them go? >> this man was willing to put his own life on the line. it is a remarkable human moment. >> but the gunman doesn't back down. >> this isn't worth it. this is a problem. please don't. please don't. please. [ gunfire ] >> a security guard enters the room. a firefight breaks out. the suspect is hit and drops to the floor. >> at that point, he ends his own life with a shot to the head. >> no board member is injured, though the superintendent was nearly shot by a bullet that hit a notebook just inches from his body. >> you never know, in life, when it's all going to be over. and this is when you find out what you're made of. >> please don't. please. [ gunfire ] coming up, things that go boom.