I think it's implied that whoever was in the hood that took the water at the end was the one who was sneaking in and killing the employees when they were found. The MCs avoided that fate because they were looking out for each other (or because there was 2 of them).
That part was the detective in disguise stabbing the "customer" to get the liquid he showed the inn owner afterwards.
idk if thats really the case. the other custodians were drained while the MC who found the bad guy got hit in the head instead.
plus the granny died the same way so its pond related. but just not sure what causes the deaths as the granny and the custodians dont get cloned/sucked in
A very late reply, but I think the one who’s been killing the employees are the people who got their body stolen and turned into water. She mentioned, the water smells (after it was used) and they made precautions to not touch the water as much as possible when draining it.
Previous employees might go for an easier route of going in the springs to drain it and got drowned by the person who got turned into water trying to get a body back (instead of the employees getting swapped/rejuvenated). Think of how someone drowning might drown the rescuers in the panic. This would explain the water splashing vigorously and the panel with the proprietress and water asking for help.
This would also explain how the proprietress died as well. The hooded man has left by then and her body wasn’t in a position of something drowning her, not suicide. By then she knew the water would pull her in (hasn’t been drained/cleaned) and she went to it.
Finally, my hypothesis is that prior to replacing someone, the water might be docile and that’s how the hooded man managed to get their sample. Plus, if the water was spouting like crazy I think some people might not hop in (it is not known whether the swapping occurs violently or not). The hooded man would also have been drowned while drawing water if it were vigorously pulling.
Also assuming the hooded men understood the nature of the water and swapping, they would know when to draw the right water and avoid when it’s dangerous. Though this doesn’t matter as much, them actually end up selling miracle water or getting drowned by it is not part of the story.