The OP's pseudonym when joining last month might be a clue?
Fair cop, I was being a bit dull.
The question isn't applicable only to Airbus twins, however.
That might be true but TBF it most certainly isn't true for all twins, I know of at least one type where (providing there are no other problems with the bleed system) in the event of an engine fire, bottles fired, fire handles pulled and turned etc, the system configures to allow full wing AI both sides if needed and continued operation of both packs. The engine isolation actually happens at the engine fire wall.
I'm not trying to be over pedantic, just perhaps emphasising it helps if OPs are more specific when asking questions about exactly which type is involved( well, that's my excuse)
