The way I would interpret it (but who knows what CASA mean) is that you must take off, not fly more than 25nm radius from that departure aerodrome, AND, return to the same departure aerodrome.
I agree that it is unclear if you can land at other aerodromes within the 25nm radius for a pitstop, but my interpretation would be that you are expected to return to the departure aerodrome at the end of the flight.
So what defines a flight... i.e. if I landed for said pitstop, is it a new flight?
Of course that is all just my interpretation as it is not clear. I am also not far of getting my RPL, so am interested in understanding what the hell that actually mean
