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Unless the back jukes the linebacker 4 yards away, that wouldn't have gone anywhere so the deep pass was the correct read, Rattler's just not used to safeties who can close that fast yet, so didn't know he needed to put it further downfield, or just isn't used to throwing that route yet.
A learning moment.
That linebacker got caught flatfooted. If you hit him in stride it's a gain. Even if it's a no gain that's better than a pick. It was 1st and 10 not 3rd and 10.