"I mistook them for inky caps [...] even though I spotted an Amanita nearby [...] I should have been more suspicious as mushrooms do grow in colonies."
"I couldn’t find my Mushroom book, was in a hurry, so I trusted my judgment, fried them up in olive oil, and ate them as a side dish."
"I should have recognized then that they weren’t inky caps, because inky caps exude a black substance when you fry them."
"At that point, I got concerned. I covered it up by saying, “I’m OK, I know what I’m doing and I don’t feel sick.”"
That's... a lot of interesting decisions, for something potentially so deadly. Had I known this person afterwards, I think I might have politely declined any dinner invitations.