Regarding pressurisation problems; The outflow valve/s would have driven closed under stanby electical power (Rat/battery)and the cabin leakage rate would then determine how long before cabin altitude equalled aircraft altitude. Depending upon the condition of door seals etc. it could take some time. It (cabin alt) obviously reached the mask trigger point (approx 13000ft ??on Airbus) but the leakage rate is probably a lot less than most might think, maybe 700 ft/min for example.
This is not like an explosive decompression and can be equated to the volcanic ash scenarios in Indonesia (BA747) and Alaska (KLM 747) where all 4 engines flamed out and the crews were faced with conflicting requirements of best glide speed versus high airspeed for windmill relight of engines and cabin pressuisation.