I know the damage an exploding O2 bottle would do. I have been handling 02 and 02 filling systems as well as teaching the physiology of it for 25 years. I have seen diving cylinders and O2 cylinders fail. I have caused many of them to fail during testing over the years. For an O2 cylinder to fail in an explosive manner would require a combustion incident. For it to split on impact would require it to be attached to a point on the aircraft where the loads were transferred directly to it. A loose O2 cylinder is more likely to have bounced out intact rather than rupturing. I had one fall of the back of the RIB once and bounce down the dual carriageway without harm!
I think the O2 bottle in this instance is a red herring. I posted some photographs a few years ago on here of what an O2 explosion does look like.