Sorry, my mistake. I had a theory, was more speculation, I would say.
I noticed something about the intro. Josy said some strange things in EP9. For one thing, to make the MC have a heart attack too. But why? In the detective game Josy again says so the drink in the glass could have been poisoned and the Tode guy drowned on his blood. The wine on the table was still sealed, but the MC later said so that this wine could be poisoned.
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I don't think so Isabella served poisoned wine, but I game inquires for example Derek to JB about the lactose in his food. Could be unpleasant for the party guests if someone suffers from lactose intolerance. By the way, one of the side effects is vomiting, which KRJ did and she ate from JB's food. But that reminded me so Wendy said she is allergic to pineapple and lime.
Maybe a silly thought, but what if someone at the table in the intro had an allergic reaction to something and went into anaphylactic shock. Symptoms of this also include reactions of the cardiovascular system, reactions of the digestive system such as cramping abdominal pain or vomiting.