Ruben is dead. The whole kidnapping process actually went quite smoothly; he even guarded against Green Sorrow, but he never expected that Green Sorrow never intended for the plan to succeed.
From the beginning, the plans of both sides were different, the fundamental objectives were not the same, plus other reasons like the information gap, so Ruben died with regrets.
However, Hogwarts Witchcraft Academy did not hold his people accountable. Without Ruben, this group of people wouldn't survive for long, so there was no plan to wipe them out.
Actually, Green Sorrow volunteered himself, hoping to curry favor and further increase his likability, but unfortunately, he didn't succeed in pleasing anyone.
Luckily, he achieved his goal. In three months, he successfully translated the "Yin Yang Formless Divine Skill" into content he could understand.
