throwing themselves on students, first responders doing cpr, everything they could to save themselves, to save their friends and families, , and strangers. listen to what two people had to describe earlier of the sea may sell last night. >> we thought it was a part of the show. it sounded like fireworks, fire crackers. once you heard the music cut off, you knew it was real and you see bodies dropping come of people getting trampled. >> everybody said hit the floor, everyone was laying on top of each other, trying to get out of the way. the shots just kept coming. >> trace, what strikes me the most was the access, that first responder who was giving cpr, and who got shot, the husband who pushed his wife to safety and was also shot and killed, the woman who was dragging her 4-year-old child, yelling to people, "i've got a baby" and a part of the way, an amazing seed of humanity amongst the carnage.