"I understand the question to ask how a dual engine shutdown affects the stopping distance."
More importantly, survivability..... GEnx takes two seconds to deploy (reverse) fully. Less than three to stow... The CF6-80 (Narita MD11) similar in design. Without power, the aircraft is stranded in Pitch oscillations, interrupted by un-mitigable nose gear collisions with the runway?? Elsewhere in this thread rotor burst is (described as) an emergency that takes longer to develop than the difference between pilot intervention CutOff and TCMA CutOff...?? If so, then??? Thanks.