Well, it depends.
S2 is for assessment not treatment.
What effect did them having staffing issues have upon him?
That isn't a ground for sectioning. S2 is for assessment purposes. It is actually surprisingly easy to be sectioned under S2 but not for long and not without professional consent.
If that really is the reason given then you just appeal to the hospital managers and he would be discharged off section.
Can I clarify anything for you?
This does rely upon this being the only reason for sectioning though obviously.
Yes, that would be my concern too.
You won't know until you get there.