Perhaps a better description of what happened and a link to NTSB report:

China Airlines Flight 006 - Wikipedia, the free encyclopedia


Normally, loss of a single engine in cruise flight is a non event. At some weights and altitudes flight may be continued with no change in altitude and little change in airspeed and just a twist on the rudder trim. At higher altitudes and heavier weights a descent must be initiated prior to reaching minimum maneuver speed.

They wasted time on an attempted restart well outside the envelope while airspeed decayed.