I realized something, these two cant be prisoners released from malivore due to the fact malivore isnt allowed to swallow them. Maybe they will pull off some thing that they were thrown into malivore rather than malivore coming to get them but he is self conscious, why wouldnt he just spit them out?, we have seen that can happen

So i guess vardemus and sebastian just happen to be walking around when these events take place?, i find that a bit odd

Maybe vardemus and sebastian were in some supernatural prison and freed when malivore got blown up or whatever, similar to when the ancestors veil got blown up or whatever and it freed the hollow but even then they didnt explain why that was so idk why this would be the same here, maybe vardemus and sebastian are too dangerous to be let out and malivore is used as leverage but cmon, are we supposed to believe a witch and vampire are more dangerous than the eater of the dark himself?

I guess its always possible the writers even forgot their own rules yet again, im not ruling that out but for the time being, no, i dont think these two are freed from malivore