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[Forksref]

Whether these mechanics are approved or not, they are horrible.

The deep official spends time backing up to the sideline instead of going downfield. When the TE leaps from near the endline, by the time the official gets to the endline, the receiver has already made his play so I don't know how he can tell if the receiver was stepping on the endline or not.

This mechanic of starting at the numbers and then backing up negates the purpose of the deep official giving sound deep coverage. That backing up is totally wasted effort and time. Plus, we always want to have as wide an angle as possible to keep everything in front of us.