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The Ravens like to chuck it up, as a strategy related both to their personnel and to league trends.
Baltimore has two burners in Jacoby Jones and Torrey Smith who can stretch the field, so it make sense they would attempt a few deep passes each game. But they also recognize a secondary benefit of deep throws—pass interference.
With a cornerback often trying to stay with his man and track the ball on a go-route, limbs can get tangled. The Ravens are the beneficiaries of such occurrences more than any other team. They're first in the league in drawing PI (13 times this season) and have the most yards received from such calls (272).
To that end, the Patriots CBs will need to do the best they can to stay with receivers in coverage while not disrupting their routes. That likely means not tracking the ball until the wide receiver's body language shows the pass is incoming.
One look back before the ball is in the air could mean getting dusted by the Ravens speedsters with nothing but a quick change of angle or double-move.
That means the Pats need a big game from Devin McCourty, their star center fielder at safety.
He'll likely always be the deep safety in a Cover-1 or Cover-3, as Steve Gregory's game isn't really shell support due to the awkward angles he takes to the ball. The CBs need to know that McCourty has their back on the deep shots, especially if they're playing press.
Basically, Baltimore's ability to convert the deep shots they'll take comes down to whether McCourty can diagnose Flacco's target and get to the ball in time to make a play.