It's too bad that there will probably never be an official, this-is-the-exact-truth-of-every-aspect-of-what-happened story for us to eventually read.
Who fired how many rounds from what gun, what happened first, next, last, etc. etc. etc. If you read 10 news stories about this event, you will probably get at least 8 different accounts. But there exists no ONE discrete agency that will be the final say, definitively, of exactly how it all went down.
Regardless of how good that cover is at stopping bullets, it's better than being full-front to the shooter; it may take some velocity and foot-pounds off the bullets, and it will obscure you from his view. Much harder to hit a target when you have to estimate where it might be behind a cover object, yes?On another note, the Vietnam vet that took cover behind a column that turned out to be faux; bullet went right on through. Are we ready to assess our cover under fire?