Is it not a possibly lucky event that whatever flew off the Oxy Bottle (Presumably the brass regulator?) actually hit the door handle and was therefore able to dissipate some of its energy into a moveable object...rather than hit the roof and possibly hole the aircraft from the inside? That door handle may have saved a bigger event?
Interesting thought.
Many people have also probably wondered about what would have happened if the liberated O2 found an ignition source but have tastefully kept their thoughts to themselves. At the risk of starting a bleak discussion, my understanding is that cargo fire systems are based on fire suppression only.