Attn. Pacplyer post 830
Glad someone reads my posts!! I'd go further, actually. I think the top fitting of the bottle failed when the bottle was held in position. Why? Because the valve travelled on a vertical trajectory. This suggests that either
1. The assembly failed spontaneously; or
2. An item of baggage forcefully contacted the upper part of the tank assy when the latter was in its right and proper place.
The alternative — that the bottle was swinging around all over the place, and the valve assy took off at an angle that exactly compensated for the bottle's leanings — is too daft to contemplate.
My money is on option 1. — spontaneous failure of the cylinder-valve assembly.