Students react to school officer who did 'nothing' during Florida school shooting

Broward County Sheriff Scott Israel said Scot Peterson failed to enter the school to confront the gunman during the shooting at Marjory Stoneman Douglas.
7:47 | 02/24/18

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Transcript for Students react to school officer who did 'nothing' during Florida school shooting
Completely and totally disgusted. Shock and anger after this stunning admission. What I saw was a deputy arrive at the west side of building 12, take up a position, and he never went in. Sheriff described how Scot Peterson an armed school resource deputy assigned to protect Marjory Stoneman Douglas high school failed to take action, he waited outside four minutes while the shooter was in the building. What should he have done? Went in. Addressed the killer. Killed the killer. Cops know it's their responsibility to go in it will. We all know in an active shooter situation in the first couple seconds is when most of the death occurs. I'm Scot Peterson been a police officer for 30 years. The deputy in question, 54-year-old Scot Peterson had wor worked at the school for eight years. He and I talked many times over the years. School internal documents painting a glowing picture in 2014 awarded school resource officer of the year commending him as reliable. I knew when I heard in the cafeteria the hairs on the back of the neck I said that never goes on. He is seen describing his response to security scenarios. I ran to my trailer grabbed my can id, shorts and sneakers and ran to the cafeteria and sure enough were four males in the cafeteria saw me peeking through the glass, I chased them, I'm getting older -- Peterson caught those teens but officials say on Valentine's day he didding in. You don't think about it happening at school when it does you need to act as a police officer. Faced as suspension Peterson opted to resign and retire but told ABC he did a good job in calling the exact location and getting units out there and adding first responders don't go into active shooting situations they have failed. It has to be something you have to understand. You can't run away from the danger. The response to Peterson's lack of action has been swift. To hear he didn't do his job, he signed up to protect our school. Were you surprised. Shocked that someone trained with a gun, you know, I don't know all of the ins and outs of the story but all of that is actually true then that's beyond comprehension. Department Scot Peterson that's the indicates where someone who didn't act prop early or they were coward. Week and half after the trajectory Eddie that claimed the life of 17 students and teach hee teachers, Peterson's ibarrabarra inaction coming into focus. Tipster saying Cruz was going to explode describing him as a violent child who posted about firearms and ISIS and worries about him getting to a school and shooting the place up. We keep hearing every day about something new that was missed or something new that should have been done based on information that was reported to law enforcement. This was just one of dozen of concerned flagged to the authorities. Since 2008 the Broward shiffri sheriff's office was involved in 23 calls involving he or his brother. According to the sheriff the calls are still under review. Yeah there was a fight in my house. A kid, and my son punching him. That's why he left the house I need someone here because I'm afraid he will come back, he has a lot of weapons and he put the gun to his brother head before it's not the first time. ABC news obtained recordings of the fright evaniening 911 calls by the family who had taken in Cruz after his mother died. He is going to get his weapons right now he's pissed off. Soon after another call this one believed to be Cruz calling 911 claiming he was the one attacked. Hi I was just assaulted now. Someone tried to attack me and say they were going to gut me if I came back. The caller then indicating he was distraut about the recent death of his mother. Thing is I lost my mother couple days ago so I'm dealing with bunch of thngs right now. All this in addition to reports from class mates who told school officials about their concerns over and over. He talked about killing our parents, friends, boyfriends and girlfriends. Lopez says she noticed disturbing signs from Cruz from time to time. He would have knives in his lunch box you skrant knives it had is a school he's like hey guys want some knives. And haunting media posts. He posted pictures of 15 or more firearms on his bed. It was just ordinary to him. So many questions still unanswered and as authorities acknowledge mistake after heart breaking mistake. This person wasn't stopped from legally purchasing a weapon. Was not arrested. Was not deined. And was never forced to turn in his weapons. In a surprise Florida's governor announcing proposal for new gun control regulations. We will require all individuals purchasing firearms to be 21 or old. And proposed banning the sail of bump stocks. Preventing the mentally from buying a gun. And requiring a law enforcement officer to be present in every public school. Change is coming and it will come fast. This is a time I believe we must all come together and even cross party lines. The govern's proposal a rare break with the president who believes specially trained educators are the best solution to end school shootings. I would rather have someone who wants to protect their students than someone who is standing outside and doesn't know the students. And the teacher would have shot the hell out of him before he knew what happened. A few hours later he doubled down. The security guard doesn't know the children, doesn't love the children. The teachers love their children their pupils their students. The fact is if you give a teacher a gun that they are allowed to take into class you have a host of issues. Does that teacher know when they would be allowed to even pull the guchb out and point the gun to somebody. Are we prepared to have a teacher go through the same tactical training and potentially make mistakes similar to law enforcement officers. Do you want to have a gun. Dmo it's not a good idea. I'm trained to teach. I have 36 years here. Guns are just too unsafe. For "Nightline" from parkland, Florida. Next, the powerful performance sounding the alarm

This transcript has been automatically generated and may not be 100% accurate.

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