Larry, that brings up a pet peeve of mine: the frequently-seen lack of communication from pitcher to catcher.
I was watching a pitcher-catcher camp at a well-rated D1 where I knew the coaches well, and on pop fouls they were actually teaching the pitchers to yell "up, up" on pop fouls. Up? No kidding?! How about pointing and yelling "Back, third base, first base" or (in this case) "feet". (Oops. They fiixed that little oversight after the break.)
The pitcher is looking at the situation, the catcher is either trying to prevent a runner from advancing (as in the case mentioned or on a WP or PB)or get the foul out, and (more times than not) the pitcher is watching and hoping.
Like too many aspects of catching, this is simply not taught. It is, however, one that the boys can 'teach' themselves.