It’s the sewer they’re in. At least I imagine it like that. It’s often when the colours go really green, it’s just showing that they’re still down in those sewers where light shines down by railings, and there’re these exhausts. I mean it’s drawn like that literally sometimes.
The green light belongs to the life they’re stuck playing in.
Everything that’s happening to them is under the green light right now. It’s what shines down.
Idk if the artist will do so but somehow the opposite — no green light/mood — would mean that they’re out. There’s the first breeze, when they’re no longer down in the sewers (as I keep repeating… >_> ) that go even lower than just out in the streets like just deadbeat drug dealers or even a gang of dogs.
Basically, they’re way deep under. All submerged.

See? The ‘green light’ is a metaphor- and a while ago I said, someone shut the green light but y’all misread and sent me dislikes
I deserve softness and love y’know
(இ ᎔ இ`)✿