For what it's worth, there's usually "some" differential between what a play looks like, when drawn on paper, and actually executed on the field. Sometimes, even in a playoff game, the reality can look a lot different than it does on paper.
Be that as it may, a specific, relevant question from a sideline coach may be very helpful to a wing official, reviewing his handling of any situation, depending on specifically WHAT was asked and HOW it may have been presented, as well as what other questions and comments have been passed along that sideline . Of course, not knowing how "the actual question' was asked, it's hard to suggest what value may have been conveyed, but "Who are you watching" is not likely to produce a constructive, positive or helpful reply.
The "appropriate" answer depends on the size of the officiating crew (4, 5, 6 or 7 men) and would be affected by how well (and how covertly)any suggested PICK may have been executed.
I'm always conscious of the old advice, "You can draw a picture of a beautiful woman, but you really can't "make love" to it".