[AtlUmpSteve]

So, I pregame a scenario in 3 man that addresses Andy's #2. I'm +1 on the OP response to wait until asked, UNLESS U3 used my suggested "variation".

Whenever an umpire is in B in 3 man, there is the possibility of a ball to center where F8 is coming straight in; and a ball dropping can create a quick force, or a shoestring catch can create a snap throw to 2nd. In many cases, no one else can reasonably make the call.

My pregame is to say this play only, F8 charging; ball either side, no issue, chase. I ask my base umpires on this play only to open up, and show the crew a stop sign hand trailing. That says, "I've got trap/catch, AND I'm pivoting with a throw, and I've got the snap throw to 2nd.

Yes, to those that ask, I am not pre-gaming a variation from approved mechanics; I am bringing to the attention of my crew a game situation that might (should) be addressed in that moment.

That said, I think that covers a hole in the standard; and maybe could have helped in OP, had it been pre-gamed as a possibility.

But that's just me, not anything that changes the book.