In every BFR I am asking the instructor to perform emergency scenarios without discussing them with me first (at a safe altitude of course).
It has much more value in my opinion than practicing emergencies which were rehearsed on the ground. In real emergency there is no warning, and we should be trained to handle real emergencies. The instructor should wait long enough to give the student a chance to react before taking over. I trust that Marty did not really wait till the last second to react, even if it sounded that way.
I believe tunnel vision is the cause for most accidents, and not lack of training. Otherwise we wouldn’t have so many accidents with experience pilots on the controls, including instructors. One way to look at tunnel vision is the opposite of armchair quarterback. The picture is much clearer when one is not stressed or fixated on a single task, so we all tend to believe this could not happen to us.

Ramy