Guys, cover 2 is meant to stop underneath throws. It leaves the two safeties alone up top to cover halves of the field. Cover 2 means it's a 2-deep shell. Just as cover 3 is 3-deep, leaving one safety and the two corners to cover thirds of the deep field. And cover 4 is 4-deep, leaving two safeties and both corners to cover quarters of the deep field.
I'm not meaning to sound like a smart ass, but it's a lot harder to cover deep parts of the field with 2 high players than it is with 3 or 4.
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