What do you expect Muheun to do, seal it again? Then what? The crazy association will just unseal it again later. It's better this way.
The reason they seal them is bc they can't kill demons. If you saw something that was deemed impossible happen before your eyes you'd be surprised too I bet
What do you expect Muheun to do, seal it again? Then what? The crazy association will just unseal it again later. It's better this way.