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I wouldn't expect an explosion. But that O2 is under high pressure so that it can be delivered to highest part of the building. You puncture it and you could be taking O2 away from somebody. That O2 line could be going to surgery, or the ER, or maybe even a cardiac floor. Thats what I meant that I don't to be in the vicinity. Because do you want to be the person responsible for that?

But, like it was said, it is a mental hospital. So that shouldn't be an issue at then.

Well, I think the issue they are trying to bring to light was that he was NOT supposed to be carrying a firearm while working. The other issue is that he fired and possibly missed. I don't know how this particular hospital is set up, but most hospitals have oxygen running through pipeline throughout the building to provide oxygen to patients in their respective rooms. My concern here is that IF that bullet were to penetrate the wall and hit that pipe, well, I don't think I would want to be in that vicinity.

Besides, he is only on temporary suspension until the investigation is done. They do the same to police officers when they fire their weapons. They just want to piece everything together and maybe let this fiasco die out for a bit. If the security guard did EVERYTHING he was able to do right, then he stands a chance at going back to work.