Judging by the lack of screams behind him, Poisonous Jack wasn't poisonous.
Nevertheless, the followers of Zhuihsiksidzhire did not despair, because all they wanted in this life – to drown and go to the seabed – was still ahead, so they could live peacefully waiting for something good.
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I suppose, based on what we saw, death in a pot is also considered appropriate and honorable.