Usually demos like these have someone back stage doing the exact same thing, ready for instant cut over. If that also fails, a pre-recorded video is the 2nd cut over.
This made me like OpenAI even more. Live demos are so hard, the internet in this venue can be flakey, you are super nervous, etc..
This stuff takes weeks to prepare and I doubt these presenters had that much time
HOLY SHIT OpenAI's live demo for "Dots" completely FLOPPED💀
and then they CUT THE AUDIO on the official stream to hide it
I caught the original: