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warshawlawIn the olden days, coaching staffs were not what they are today and managers took a much more active role in player development if they were so inclined. Showing Duffy working a bat is indicative of his active role in player development. There were also a lot more player-managers, which means that the idea of seeing a manager on the field was not anomalous. This carries over to the modern era in some cases. Tommy LaSorda was well known for throwing BP while he managed.