The aircraft were able to refuel on the other platforms just miles away when needed. That's the good thing about downmanning platforms in the basin, plenty of landing pads nearby. They were shuttling the offshore guys to them anyway! The fire on the Tern was related to a gas compressor that blew. The reason the downman was called for was that initially the deluge system was not putting out the small fire that insued, though it wasn't getting worse. Eventually, whilst the guys and gals were getting transferred off, the fire was extinguished, and shortly afterwards they were all transferred back, causing havoc to the routine crew change flights!