PrimeWire

Again, I asked AI: An oxygen tank can potentially rupture or explode if shot by a bullet, but the outcome depends on several factors, including the tank’s construction, the caliber of the bullet, and the conditions at the time of the incident.

When an oxygen tank is punctured, the sudden release of high-pressure oxygen can cause a fire if there is an ignition source nearby. The oxygen can support combustion, leading to a fire burst if flammable materials are present. However, the tank itself may not explode in the way one might think; instead, it could rupture or become a projectile.

So you are correct regarding oxygen itself not being flammable, but if the right circumstances are met, it could trigger a fire burst. I would assume that such circumstances are normally not met as safe storage is required and no highly flammable or explosive substances should be stored close to oxygen tanks according to regulations and safety guids. For a movie, nethertheless, something with a fiery explosion is more relatable as most people will not know or understand the chemical properties of oxygen.