Overriding Your Partner??

[CO ump]

Many times partners will have some sign they give to their partner in certain situations to let them know they may have pertinent information that may be useful.
When given this sign the calling ump may or may not choose to get it or use it.
For a PU to force a conference on a judgement call made by U1 is uncalled for and absolutely inappropriate.

Another disturbing part of the OP is this:
It's one thing to be in B or C position, miss a pulled foot and feel a need to ask PU for help.
It's quite another to rule and signal pulled foot, make a safe call and then change the call.
You either saw the pulled foot or you didn't. If you indicate pulled foot then you darn well have better seen the pulled foot. If you saw the pulled foot there is no way PU should be able to change your mind nor should he even try.