I actually recieved this aircraft on it's return to DXB, so a few more facts to throw into the pot. Firstly the damage was not readily visible from the cabin, yes it had lost a lot of material but it was all at the rear inbd end of the thrust reverser and the primary exhaust so was hidden by the wing. In fact the thrust reverser translating cowl (the bit that moves when you deploy reverser) outer skin had no visible damage to my recollection. The crew had the messages as Jet II has already stated but they had no abnormal vibration and all other parameters were ok. So given that they couldn't see damage and the engine appeared to be operating normally, opted to carry on. Seems pretty reasonable to me given the information they had.
When I showed the crew extent of damage they were, to say the least, rather surprised!!
