You mention announcers wrongly commenting on penalties during games. Have you watched enough games announced by Herbstreit to know his comments about DPI and the need to turn one's head? If you are familiar with his comments, can you please comment on them?
I'm not familiar with his comments specifically. There is nothing that requires a defender to turn around to avoid DPI, but it's a pretty good indicator. One of the 6 categories for DPI is early contact not playing the ball. If a defender is beat and not playing the ball (impossible without turning to see the ball coming), the threshold for allowable contact is low. Minor contact or hand fighting between both players is likely nothing. Out of he times the contact perfectly is likely nothing.
If he turns his head he's now playing the ball and an long as he doesn't commit one of the other categories (arm grab, arm bar, hook and turn, or cut off route) it's likely nothing.
So not turning isn't automatically DPI and turning doesn't generally absolve you. There are many instances where the announcers are right that a defender wouldn't have been guilty if they were turned and playing the ball.
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