Bearcat
After an engine failure on a 747-400, two of the major considerations as to whether or not to continue or divert/return will be possible related damage to the adjacent engine, another will be the en-route terrain and the implications of losing another engine.
A 747-400 at max weight on 3 will probably climb to about FL280, five hours into flight with the weight down at about 340 tonnes a second engine failure will see it maintaining about FL220 on the remaining 2 engines. Greenland MSA's probably top out at about 15,000ft so not a problem.
All this would have been considered in developing a strategy for the flight. Give us professionals some respect.