I watched a video interview of a prominent doctor/researcher in Korea, Professor Kim Woo-joo from Korea University Guro Hospital. He talked about the church in Deagu where a large number of their infections were transmitted, and he said that the group singing they did put more virus particles into the air (more than just talking, which makes sense), and that's why so many people who worshiped there caught it.
That includes yelling, as well. Forceful exhalation by an infected person causes virus particles to spread out further than "normal" before falling to the floor, so in a case like that six feet is not far enough away to be safe.
I found the video in case you'd like to watch yourself, and it's mostly in Korean with subtitles: https://www.youtube.com/watch?v=gAk7aX5hksU&app=desktop