One of the three sea level engines went out and stayed out. It didn’t look normal. The numbers stopped updating with one engine still on.

Right, I just watched it again and it didn’t look normal.

But interesting that telemetry showed the failures starting a few seconds before loss of telemetry, the videos posted here show a massive explosion later on. So something was going wrong for some time before, and the explosion was only a consequence of that.

Or it was the FTS reacting to the engine failures.