In Zaheer's next over, Kumar Sangakkara played one on to his stumps. Zaheer's figures then read 2.3-0-3-3. But once Atapattu hit him for his first boundary in his fifth over, Zaheer no longer posed the same threat. His last three overs went for 23 runs, a sign probably that Rahul Dravid had made him bowl one over too many.
Makes sense? It is easy to say in hindsight. There are games which he tried as bsefore and failed. Players know the best.