Zimmer only got that angry because Pedro was going after the batter's head. Back in the 50s or 60s Zimmer got hit in the head and went unconscious for 3 weeks and almost lost his life. He knows first-hand what a fastball in the head can do and he was only standing up for his players. Plus old Don isnt that fast and Pedro could of easily just gotten out of the way. That was a fucked up thing to do.