[Chewbarkah]

In an official briefing, a colonel in the Texas DPS states that at 11:33 the teacher was standing at the back door when a LEO “sped around to the back door, thinking she was the shooter, only to realize the person he saw was the teacher.” (My paraphrase). If the colonel is to be believed, at a point when the shooter had ripped off lots of rounds and LEO was on scene, rushing around searching for him, this teacher was standing at the OPEN back door. Despite what would seem to be clear and present danger, she apparently walked away without bothering to close and lock the door. Minutes later the shooter entered the open/unlocked back door and started murdering children. I’ve wracked my brain for anything to explain this; “forget to close the door” is not plausible.

[Svartalfiar]

If the colonel is to be believed, at a point when the shooter had ripped off lots of rounds and LEO was on scene, rushing around searching for him, this teacher was standing at the OPEN back door. Despite what would seem to be clear and present danger, she apparently walked away without bothering to close and lock the door. Minutes later the shooter entered the open/unlocked back door and started murdering children. I’ve wracked my brain for anything to explain this; “forget to close the door” is not plausible.

And apparently the officer didn't notice the door propped open either? And they somehow let the shooter get into that area (that was obviously already cleared), so how did he get back around the cops line to even make it to this door, apparently behind the cops' line of advance?