That's really too bad. Rivera had posted rides on Strava showing him training with Bernal.
What's weird about Bernal's crash to me is that they were on TT bikes, and no one else crashed. If it was a tight paceline, the whole lot of them would have hit the deck.
A couple days before the crash, someone posted the team riding (hauling @ss) with two motorbikes and at least one team car in pursuit. It seems odd that with that many people looking out for the cyclists that there would be any crashes at all.
Here's a link to the Ineos team riding a few days prior:
https://twitter.com/i/status/1485076641336512512
Edit: LanterneRouge did a youtube video on Bernal's crash as well:
https://www.youtube.com/watch?v=Dd4P-ajSwIM