Or.......
1. Coach shoots 10 rounds and hits no one, and gets shot and killed. Shooter gets another gun.
3. Coach hides in a room with students until law enforcement gets there, and when they see him with a gun, they shoot him
Also plausible...
Since we are just making shit up let’s say her roommate and her boyfriend walk in, and get shot too.
This is literally George Zimmerman murdering Trayvon Martin. No story necessary.