The only answer to a bad guy with a gun is a classroom of...

The only answer to a bad guy with a gun is a classroom of kids with a bunch of rocks. Wouldn't they have to keep individual samples in their desks to be able to reach them in time? Wouldn't they need practice (at least a period a day) to enhance their throwing skills? Wouldn't a David-style slingshot at least be advisable as a delivery system? I'm not sure this idea has been thought out. This School Has Been Arming Classrooms With 5-Gallon Buckets Of Rocks In The Event Of A School Shooting"If you have a 5-gallon bucket full of river stones, and we have 25 students and a teacher, it will serve as a deterrent."BUZZFEED.COM