Steve Kerr entered the season knowing the Warriors would require considerable handling to have any chance of maintaining the health of a roster with such a vulnerable core.So far, mostly good for Golden State.But Kerr also is hoping that the Warriors don’t become susceptible to a disturbing trend around the NBA involving injuries. Rarely does a day go by without a player sustaining a lower-body injury that sidelines him for at least a week. Of the 53 players declared “out” on the injury report Tuesday, 42 fall into one of seven categories: Hip, groin, hamstring, calf, knee, ankle or foot.“I’m very concerned,” Kerr told reporters before the Warriors vs. Magic game in Orlando. “The pace difference is dramatic. This team tonight (the Magic) has really upped their pace compared to last year. Across the league, everybody understands now that it’s just easier to score if you can beat the opponent down the floor and get out and transition.“But when everybody’s doing that, the games are much faster-paced. And then everyone has to cover out to 25 feet because everybody can shoot 3s.”Kerr isn’t the only coach...