More than a few pilots new to the type have been rewarded with bone crunching landings when, at 35’ RA the throttles go to idle as they are simultaneously kicking the crab out. (The ‘yard sale’ maneuver)
I guess that's why the book (our book anyway) states that decrabbing should be done
before the flare. Kicking out crab during the flare is a dicey proposition on this aircraft. Learning to consistently make safe xwind-landings is something that takes most pilots converting to the MD11 quite a bit of practice, some a lot of practice.
If, in an MD11 simulator, you do not flare and do not decrab, you will certainly make a bone crushing landing but it will not bounce (but remember it's just a simulator). However, if you make a last-ditch flare input at say 10 or 5ft (e.g., if the guy/gal next to you forgets to flare), you will pull the mains onto the runway hard and after that become airborne again. If you pulled hard enough, you will easily zoom up to 30, 40, 50ft. If you then do nothing for just a few seconds, the aircraft will nose over and start to roll, just like it appears to happen in the horrible video from Narita. Once this is in motion there's not much you can do. It is a sickening thing to do in the sim, and it unfolds quickly.
The only way out (again, in the sim) appears to be, as has been stated here, a go-around. After a bounce like this, full thrust ASAP and wiggle your way out with some delicate pitch-control until it starts flying again.