I was listening to the live feed from the astronauts when the problem occurred. There was a lot of switching equipment between the "A" bus and the "B" bus in an attempt to isolate the problem. Finally the command came to turn of the react on oxygen bottle #1. This is the only time I heard an astronaut get excited, "Do you want me to turn off the react to oxygen bottle #1?" "That's affirmative." Other than that the astronauts were very calm and matter of fact.
The news commentators didn't have a clue about the seriousness of the situation until later.