With the Warriors rolling down the stretch, The Chronicle will offer an added layer of coverage, taking readers behind the scenes.On Thursday, with the Phoenix Suns in town, Matthew Hurwitz will call his 616th game as the Warriors' public-address announcer.The NBA is full of screamers at the PA mike, barging into the on-court action with "Dee-fense!" or other appalling exhortations."My most important rule is not to draw attention to myself," said Hurwitz, not to be confused with Franco Finn, the cheerleader type who pumps up the crowd before games.A born-and-raised San Franciscan who attended Washington High, he has also been the voice of Menlo College sports for 19 years.If the Warriors go on a first-quarter run and the visitors call timeout, I'll give it a certain kind of energy.