The pagentary’s over. For a few hours, at least, it’s less about history and fancy new uniforms and more about job No. 1 for both teams: Stopping the option run attack. So far, both teams have prevented big gains — the key to slowing down misdirection offenses that can create open space in a hurry. That duty falls primarily to the linebackers, the defense’s “second level,” who have to sift through the fakes and counters in a split second, find the ball and attempt to separate it from the ball carrier. Navy senior outside linebacker Jarred Shannon introduced himself to…