Mattingly had gone to the mound to arrange the defense. As he turned to the dugout, Dodgers first baseman James Loney(notes) asked one more question about where he should play. By then, Mattingly had stepped on the infield grass.
Rule 8.06 of the Official Baseball Rules stipulates a trip to the mound begins when a manager or coach crosses the foul line and ends when he leaves the 18-foot dirt circle surrounding the pitcher’s rubber. Returning to the dirt constitutes a second trip, at which point the pitcher must be removed.
Mattingly stopped and walked back onto the dirt below the mound, giving further instructions to Loney as he went.
No, no, no!” Mattingly heard plate umpire Adrian Johnson shout. ”You can’t go back.”
By then, however, Mattingly had covered the two steps back onto the mound.
Giants manager Bruce Bochy came out of the first-base dugout, pointing.
”He can’t do that!” Bochy yelled.