And another thing, Naberius Narnia disguised as Fenrir at Deviculum told Iruma that humans are disgusting creatures that must be eliminated immediately/on sight. As an idea, Naberius Narnia doesn't want Iruma deported to the human world, he wants him dead, that's why I think that necklace on Iruma's neck could actually be a bomb and Narnia has the detonator.
In short, Iruma goes to that area where that door leading to the human world is, and Naberius Narnia is something like: Who told you that I would take you to the world you come from and Narnia pulls out the detonator.
If something similar happens as I specified in "briefly" I imagine the version where Iruma's supporters, the mini rescue team formed by Ameri;Azz-kun;Clara;Opera and maybe Kalego are in that area, and they are lying in wait and hearing Naberius Narnia's speech about wanting to kill Iruma. The 4/5 would take Naberius Narnia to a good fight (imagine it as a kind of street fight) because in that area the demons' powers are nullified/diminished, meaning it will be 4/5 (mini rescue team) against 1 (Naberius Narnia), also one of the 4/5 could film Naberius Narnia when he gives his speech so they too have proof in case they need it.