Machaca, Spanners & NSEU, thank you; I stand corrected. I agree the bottle was vertical in that position but it leaves a lot of unexplained questions still.
I have a total of 18,680 hours operating as a F/E on CV880, B707, L1011, B747-100-200-300 pax and cargo. In 32 years have never encountered a problem with pax or crew oxygen. This incident is a bit of a worry, to say the least.