You are both suspended!
>>1
Blue lanterns are a warning that gaijin should keep out.
Just a gaijin here, but they may refer obliquely to hitodama. Look it up...
>>4
That's just it, I haven't found anything about the lanterns themselves, only the hitodama.
>>5
If the lanterns are related to hitodama, it is probably nothing more than than a mood-setting thing: "By walking down this passageway you are descending into the realm of the dead - so beware!"
Never played the games though, couldn't say for sure. Also lol gaijin.
maybe it's something like torches in dungeon of Western sword-and-magic fantasy.