The bases are loaded, and David Ortiz spits into his hands, claps twice, and digs in against the hated Yankees. New York left fielder Brett Gardner inches back to the warning track. Not 10 feet behind him, Christian Elias, the Green Monster scoreboard operator, peers over Gardner’s shoulder. Elias is actually in the spot where the left fielder would be standing in most every ballpark but Fenway Park. For a quarter of a century, he has had the best seat in the house. He has operated the scoreboard for more than 1,800 games.