While the classroom walkout was only scheduled to last 17 minutes, planned demonstrations around the country continued long after.

In the 28 days since former Stoneman Douglas student Nikolas Cruz allegedly went on a rampage with an AR-15 assault rifle, the world has changed for the students and nation. The students led the charge to get lawmakers to put new restrictions on guns and convinced President Donald Trump to explore a similar course of action.

Prosecutors Tuesday said they will seek the death penalty against Cruz, 19.

But even the ultimate punishment for the suspect will likely not make the memories that student Dylan Kraemer has of the shooting any less palpable.

\"I heard gunshots. It was the first thing -- in the hallway. It was really loud and echoed,\" Dylan recalled in an interview with \"Nightline.\"

He was in room 1214 of the freshman building when the gunman stormed the hallways, shooting people at random and firing indiscriminately through the rectangular windows of locked classroom doors.

\"And then I saw the shooter through the little window in the door ... I was looking to the side, then I could see him point his gun at me and shoot into my classroom and then I saw two of my friends die and three others get shot... I was thinking that I was going to die, pretty much.\"

Rousseau McClellan Montessori School 91 IPS, Indianapolis, IN #NationalWalkoutDay @rtv6 @ArikaHerron @NickMcGillTV pic.twitter.com/SP8fG177oy

— Josh Russell (@josh_emerson) March 14, 2018

Since the shooting, Brooke said, she keeps thinking of the classmate who was shot multiple times and how she crawled from under her desk across broken glass to apply pressure to his wounds and keep him calm. He survived.

\"PHOTO:
Jonathan Drake/Reuters
PHOTO: A senior at Marjory Stoneman Douglas High School weeps in front of a cross and Star of David for shooting victim Meadow Pollack while a fellow classmate consoles her at a memorial by the school in Parkland, Fla., Feb. 18, 2018.
>

\"I remember seeing him in such agonizing pain,\" she said, adding that the cries and screams of the classmates around her at that terrifying moment continue to echo in her head.

While more police have been placed at her school to guard students, Brooke lamented, \"I think, personally, I'm never going to feel 100 percent safe.\"

UWS highschool walkout: Fiorello La Guardia students sit in silence for the victims of the Parkland shooting @WestSideSpirit #GunContolNow #highschool pic.twitter.com/L6I0LugRZw

— Ashad Hajela (@ashad_hajela) March 14, 2018

The FBI took the blood-spattered shoes and sweater she wore the day of the shooting, she said, but she still has her backpack, now with a bullet hole in it.

\"I couldn't believe how lucky I was, that my backpack took a bullet and, thank God, I didn't,\" she said. \"Now, that's going to be forever with me, and that's forever going to be a memory that happened.\"

Broward County Public Schools Superintendent Robert Runcie scoffed at critics who have said the student movement isn't truly \"organic,\" that the students behind it are paid actors and that school officials helped organize today's walkout.

\"It can't get more organic than this,\" Runcie said at an afternoon news conference. \"I will tell you that the district has played no role in organizing any activities for our students.\"

He went on, \"This is a movement that's been organized by students who are concerned about what they see as a generation that has failed to put things in place to make sure that they're safe, that they have an opportunity to have a great future. I applaud them for that. I certainly don't encourage any student to be out of school. Being in school is the right place for you to be. But you do have moments like this where they want to exercise their rights. I think as long as we can connect it to the learning process, it can be a positive day that we're having.\"

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