SAN ANTONIO — Early in the second quarter Monday night, after taking a knee to the groin trying to block a Danny Green layup attempt, Draymond Green, grimacing, doubled over near the baseline. It was an unsettling sight for a team already ravaged by injuries. After Green left the game for good less than two minutes later, the Warriors were forced to play 2½ quarters without all four of their All-Stars as they fell to the Spurs, 89-75, at AT&T Center. Golden State hardly wilted, leading as late as early in the fourth quarter. But with more than three-quarters of their offense sidelined, the Warriors faded down the stretch. They finished 40.