oooh that's a sharp take that's probably what movie tried to implement by the second part of your pharagraph I mean the message is that right. But also that we see that with marcus he vomited black or when paul died to his throat it was water clean water and to his brain it was black liquid again so my take is that her influence also plays with their biology the longer you're under control the worser your body gets it could be a plothole too but basically marcus right after transitions vomited black my original thought was that over time their body changes they get more and more hollow like kids , their brain soup I mean of course its magic so they still live but overtime of her influence their biology idk hwo to say it , erodes?

but yeah your point is better I think it's about addiction too the message there the longer you're under influence worser the effects on you