Mr pictures,
"crossfed the power to the proper HYD Systems"
to clarify:
I was informed by a KL stationed gnd engineer that the a/c was taxiing after maintenance with only engines 2 and 3 operating......engineers at the controls. Unfortunately normal brakes operate from hyd sys 4 and alternate from sys 1. Bringing the ADP on line on either system would have averted the embarrasment or flicking up the reserve brake switch which runs off hyd sys 2 (with operating EDP and maybe ADP if the brought such on line).........switch with big flashing RED brake source light located near Capt R knee.

I operated into KL the next day and the gnd engineer took me to the a/c. No security about so got withing 20 metres ...... the visual aspect to the external damage was incredible and I understand the internal damage to structure just as so. First class area (seats 1-10 or there abouts) floor pushed up towards roof of lower cabin.

Anyway, back to topic. There still seems to be some confusion re the topic of critical eng. I have quite a bit of time on type and can assure those that it is the upwind engine. I beleive the Q comes from a tech exam run for first joiners to a "swoosh" airline based in Asia (now that one cannot be too difficult to work out). Raised eyebrows will be accompanied by the answer of downwind donk!

Which is 'the' critical engine? The one(s) still turning, regardless of crosswind. Others are dead weight; fly what you have.