AITA for sending someone to the hospital?

One time, I happened to be in this city. I don’t really remember the name, I think it was like Watican or something? There was a huge crowd gathered in front of a building, so I went with them to see what they were all looking at. Then, two people came out of a balcony and I recognized one of them. It was Dave! I didn’t recognize the other guy, so I asked the guy next to me, “Who the fuck is that on the balcony next to Dave?” As soon as I said that, the man immediately collapsed from shock. Feeling embarrassed, I slipped away and distanced myself from the crowd. I later saw an ambulance come. Even now, I still feel like a terrible person for potentially causing this man to go to the hospital. AITA? Also, who really was that guy standing next to Dave?