Dec. 1—OKLAHOMA CITY — Fourteen seconds into the second half Wednesday, Devin Vassell buried a quicktrigger 3-point shot. That put the Spurs ahead by 20 over heretofore hapless Oklahoma City. The end of one of the longest losing streaks in club history was less than two quarters away. Instead, the young Spurs limped out of OKC with a 119111 fall-from-ahead defeat, and another lesson learned the…