All of it made sense now. Zaen was seeing less and less of the test subjects as days went by... He soon realised he wasn't seeing less of them because they were busy, but because their number was dwindling down slowly. He finally couldn't keep it in and one night asked Venus and Miranda about it while they were having dinner.
The look on her face said it all. They were trying to hide the fact from him but he caught on to them. So they had no choice but to reveal the fact that the young ones were not being able to handle the ghoulish cells in their body and as a result, they were dying.
The news was shocking to him, but he also knew if they weren't able to help them out, no one would have. There was nothing he could have done for them. As helpless as he felt he was at peace knowing that Artemis was putting them to rest before things got worse for them and giving them a proper burial at the beach.