Gee, thanks bug.
(But the APU thrust comment was trivia only, obviously it can't augment loss of a 50-60,000 lb thrust class engine; I should have put in a smiley in there.) Some a/c MEL's can launch with items like bleeds inop provided a running apu is there to back it up in case of another engine failing.
I guess I'm the only one that's ever encountered that....
I know, I know,
back to the drawing board....