Time to reposition Ump or get the ball to F1

[umpjim]

Thanks for the responses guys but does anyone know where this stuff comes from? Have you been trained that way? Has it been that way in the past? Why after a base hit with now an R1, the fielder and coach can't understand why I tell them no unless somebody wants to talk to F1. But after an infield single or error with R1 nobody needs to put their hands up for time.
What do they teach at pro school to reposition?