I would guess TC that it alludes to his aircraft registration. They have a different numbering system over there. Besides you didn't answer his question.
N5696s - the height at which you would pull collective depends on a variety of factors including your aircraft type - high inertia types are more forgiving and as a previous poster says it is actually possible to become airborne again with the rrpm left after an EOL. With a low intertia type your rrpm would be very low on touch down.
Apart from training I have never been in this situation (and never want to) but as previous very knowledgeable pilots here have indicated it will come as a surprise and the only defence you have (apart from avoiding the HV curve) is your reaction time. When you see the ground rushing up at you - you will pull the collective!