Bruce Bochy shook hands and greeted former player Dave Roberts, then they walked to opposite dugouts this time to manage against each other as NL West rivals. Hunter Pence hit a grand slam in the eighth inning, Joe Panik drove in three runs and keyed San Francisco's comeback, and the Giants rallied past Los Angeles 12-6 in their home opener Thursday. ''You play all nine innings and you keep going no matter what,'' Pence said.