Scott Peterson? Really?
...........
My first thought too when I heard his name.
Thread info from another source........
When gunfire broke out, Israel said, Peterson was in a different building,
helping resolve an unidentified issue with another student.
He rushed to Building 12, but did not go inside.
“I think he (Peterson) got on his radio at a point and time and he took
up a position where it looked like he could see the western most entry
into the building and never went in,” Israel said.
https://www.cnn.com/2018/02/23/us/florida-school-shooting/index.html