We tragically didn’t make it down to the ESPN Zone today for the official unveiling of the new Screech mascot by the Washington Nationals. For a full accounting of how the event went down, head to the Sports Bog. In the meantime, check out this Fox 5 video below for the new Screech in action (we’d recommend going ahead and turning the sound off). The official line is that the Nats always promised Screech would…