Мафия 25. Under The Jolly Roger!

What is this cartoon about? Am I the only one who doesn't know?

It's some American nonsense.

Could it be that they noticed an boarding hook on the deceased? Because it's not clear from the text. But how does that relate to the green color?

Poisoning is unlikely, as the witch was blocking Kyle. Green is unlikely to indicate a role, because the muscular build is more obvious. The hook is only associated with the Mana, so the victim cannot be the Mana, because they already killed Arych today.
The Registrar was a conspirator, killed by a maniac, the green color itself (unlikely), or an accompanying poisoning/illness/nausea, etc. - is a clue.
The Mold theory seems plausible, so I will continue to build theories based on the assumption that he is possessed.