In a perfect world...
(Do they make one of these icons with rose-colored glasses?
)
My partner and I have had a productive pre-game meeting. We've covered this possibility and are prepared when the play happens.
Upon calling the B/R out, my partner glances over and notices that I am discretely giving our pre-determined "I've got information for ya, partner!" signal.
Partner calls time and immediately comes to me for help. I offer to him what I saw on the play. He then adjusts- or refuses to adjust- his call accordingly.
If he doesn't ask for help, I keep my trap shut.