I was on the Green at that section that day. If it is the group I THINK it might be, they were four people in a 9' self bailer. They were sitting in an Eddie right above the rapid and as I went through I asked if they scouted and were ok. They said that they were ready and I ran the sneak line river left with my SOAR paddle cat. There were members of their group on river left standing on shore (presumably as safety).
We did not find out the news until we got off the river yesterday in Vernal. It's a tragedy without doubt and my heart goes out to his friends who were on the river.
Please be safe everyone.
The larger the river of knowledge the longer the shoreline of wonder.