There is still a lot we don’t know, but what we do know is that police are taught not to make more victims.
The newer training is to take the gunman out as quickly as possible so as to prevent more victims.
Here is a pretty good timeline via Heather Cox Richardson, a source I generally trust:
**The timeline for the Uvalde massacre is becoming clearer.**
**After shooting his grandmother in the face and taking her truck, the gunman got to Robb Elementary School at 11:28 Tuesday morning and started firing into the school windows. A police officer responded to a call about the shooter but drove by him, instead mistaking a teacher for the suspect. The gunman got into the school through a door that had been propped open, and began his rampage down a hallway, ending up at about 11:30 in two joined fourth-grade classrooms, 111 and 112, with students and two teachers.**
**He apparently closed and locked the door. He shot the teachers first, and then students.**
**Local police responded, and several ran into the school. Two were wounded slightly at the doorway when bullets came through it. By noon, there were 19 police officers in the school and many others outside. Parents were gathering, urging the officers to charge the shooter. Officers warned them not to interfere with an ongoing investigation, arresting at least one and pinning another to the ground.**
More: https://heathercoxrichardson.substack.com/p/may-27-2022?s=r