Point 5.12 confused me a bit. It would be clearer to say "it is forbidden to pass through the passage".
Added 2 minutes later
I thought that flying was also prohibited.
Added 2 minutes later
Indeed, according to point 5.12, if the passage's guard hasn't been defeated, is it allowed to pass through (even by flying)?
If one of the conditions you mentioned in your deleted post is met, then of course it is allowed....:)
