Turn Around Update

I received an e-mail from a reader in response to my mini-rant about whether the defensive backs should turn around.

It basically affirms what I believe, but describes it a little better than I do. Apparently, Saban has addressed this in a press conference earlier in the season, however, I have been unable to find it at this point.
The technique described is called "Pinning the Wide Receiver". Saban says it is the standard technique the Alabama defensive backs use in bump and run coverage (especially on the sideline). Here's what the e-mail said:
"A basic teaching for corners when it comes to defending the deep ball down the sideline is that you don't turn and look for the ball until you can get your elbow on the receiver's chest/ribs. That's called 'pinning' him. Then you turn and you're in position to make the play. The theory is that if you turn before then, you won't be in position to defend a well-thrown ball anyway.
So I guess we'll have to look and see if the DB is close enough to get his or her elbow in the receiver's chest or ribs. I'm guessing most of the time, that isn't the case.