B..
As a kid I remember how silly the "duck and cover" stuff was. I mean, we were in a tornado. If the roof is being ripped off and debris thrown around...what were my little hands laced over my head going to do?!!! Nothing!! Like the old atomic bomb drills. Like...what is a small kid's desk going to do when an a-bomb is dropped? Nothing!!
The fact is, the IMPORTANT thing about tornado drills (or the real thing) is order, calm, and everyone accounted for. All the students in the hallway actually make everyone accounted for, very hard. It's much more orderly and calm to take children into designated safe rooms and allow them to relax. They are on top of the weather and if there was a tornado on the ground, in their path...they would have taken cover. There is no sense taking cover forever, when they have up to date information, and there is no tornado coming their way...ya know? There is a reason no one died, because we had all the information we needed.
**My last year in high school there was a tornado outbreak. We went into a designated safe room while we watched a movie. The teacher was watching the radar the entire time, and in contact with other rooms...if we needed to take action, they knew when.