hypothesis: shifts are increasing collisions

rules:

1. it is the job of the centerfielder to call off the the other outfielders
2. it is the job of ANY outfielder to call off the infielder
3. it is the job of the shortstop to call off any of the other infielders / basemen
4. if there is discrepancy, the infielder (with experience) can also call off the other infielders, but that is a team / player / situation / decision decided beforehand, or generally recognized vantage point situation

Bonus observation:

KMOX radio out of St. Louis is hilarious