Eric shot the first victim at 11:19 AM. They continued shooting outside until 11:23 AM. At 11:24 AM Eric entered the west entrance and exchanged gunfire with Neil Gardner as he stood in between the set of double doors. After Eric stops shooting at Neil, he turns around to walk into the school through the 2nd door (he's still standing in between the 2 sets of doors). At this point in time, Pattie Neilson is walking towards the doors. He shoots at her and Brian Anderson. Patti and Brian run into the Library. At 11:25 AM, Patti calls 911.
From 11:25 AM - 11:29 AM, Dylan and Eric shoot their guns east and then south (down the Library hallway). At 11:26 AM, Dave Sanders is shot as he turns the corner of the science lab hallway to enter the Library hallway. They continue shooting their guns and running around the hallways until 11:29 AM.
At 11:29 AM Dylan and Eric enter the Library. From 11:29 AM to 11:36 AM Dylan and Eric shoot at students and shoot at cops out the Library windows. At 11:36 AM they leave the Library.
From 11:36 AM - 11:44 AM, Dylan and Eric roam the hallways shooting and throwing pipe bombs. At 11:44 AM they enter the Cafeteria via the staircase at the end of the Library hallway. At 11:44 AM, Eric starts shooting at the propane bombs. He's standing at the bottom of the staircase landing. They remain in the Cafeteria until 11:47 AM. They then head back up the stairs they just came down.
They continue to walk around the hallways shooting and setting off bombs. This goes on from 11:47 AM - 11:56 AM. At 11:56 AM they go back down to the Cafeteria. They remain in the Cafeteria until exactly 12:00 PM. At 12:00 PM they are seen on the security cameras going back up the stairs that lead up to the Library.
At around 12:02 PM Dylan and Eric go back to the Library. From 12:02 PM - 12:05 PM, they once again shoot at police through the Library windows. The shooting stops at 12:05 PM.
Dylan and Eric then commit suicide sometime between 12:05 PM - 12:08 PM. At 2:38 PM, Patrick Ireland climbs out the Library window.
As we all know, there was a security camera tape change. When the tape starts recording again at 11:21 AM, the students are already aware that something is going on outside. They can hear the shooting and are looking out the Cafeteria windows. At 11:22 AM, the students start hiding under tables. Then at 11:24 AM (when Dylan and Eric enter the school), all of the students come out from under the tables and run out of the school.
I actually put together a diagram with a timeline for everything that happened that day. If you're interested in looking at it, I put it on the forum's Facebook page. Here is a link to the album.
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_________________
“And may you grow to be proud
Dignified and true
And do unto others
As you'd have done to you”