Slam dunk approach is one where aeroplane is being kept high on approach by either ATC or altitude constrain, after which you start the decent with higher than normal rate to catch up on your profile.
It is sometimes difficult for heavy jet doing this maneuver due to momentum, it takes time to reach the required decent rate and anticipation to arrest the rate back to normal.
Normal procedure for 777 is to have A/T engaged through out approach, it automatically retards at around 25 feet. For a normal approach it reduces pilot workload, for an undeshot approach it could retard where additional thrust is actually required. But again the movement of which can always be overridden by pilot.
Quite surprised to see on this reletively professional forum filled with racism comments even before any investigation been carried out. No such comments were made when European and American carriers had catastrophic accident due to reason not for me to comment. The only facts here are the pilots are male, Korean and flying experience, nothing regarding to culture.