I have a nasty feeling that getting hit by one of these is going to be very traumatic in the medical sense. A 10-20 pound object with fast spinning blades flying at up to 100mph in an enclosed space? The tragedy practically writes itself!

Kid pulls a gun in a classroom, shoots a couple of classmates before another kid starts wrestling him for the gun, ultimately the shooter and 3 students are killed a couple more wounded. Meanwhile the drones are automatically deployed in the hallways by the sound of gunfire. Their pilot is on vacation today so it goes to the on-call pilot who's currently chilling in the pool when the call comes in and therefore doesn't answer immediately. The drones are fully automated for the first 15 minutes of the incident because of this delay. One has its AI interpret a kids fortnite shirt depicting a sentient banana throwing a grenade as the assailant, flies through a window to get to them shattering it and blinding one kid, the drone however is damaged by the window and flies erratically hitting a few students in the heads giving them head injuries before crashing into the floor and shooting it's entire payload in all directions. Another drone clips a wall and crashes into the face of another student severely lacerating their face. Another interprets a pair of crutches as weapons that a kid with a broken leg is using to get to his next class, and pepper sprays him and blares alarms at him causing him to fall and break another limb, meanwhile the cops arrive on scene and pile onto the incompacitated and even more injured kid as obviously the assailant because the drones AI identified him, one trigger happy officer shoots him, and this is the moment the drone pilot finally comes online and starts powering them down since he could see from the drone that went to the source of the gunshot and related it's camera feed that the incident is cleared. Ultimately the gunman killed 3, and injured 3 more while the drones killed 4, injured 20 and police shot one more innocent because they trusted the drone's identification (oh and the innocent who was shot is initially blamed as the shooter while the cops try to cover their asses, and 20 more schools order drones due to this "success")