Am I missing something here?
As I see it:
The crew got a warning that the Standby Busses were not powered, and swirched them to Battery supply, giving them at least 30 minutes of power to both busses.
Instead of using that time to get on the ground without further incident they elect to continue on to their destination.
On all aircraft I have flown over many years, going onto battery power inflight is a lifeline of limited duration to get you on the ground as soon as possible.
Is it possible that professional pilots understand their aircraft so poorly that they think everything is ok in this situation?
The mind boggles.