If I understand you correctly you have one engine shut down already and are on the ILS you when get an engine fire on the live engine. Are you suggesting going around, actioning the memory items, shuting down the only live engine over an airport that you can't see. I know CAAC take everything literally to the letter but a dual engine failure in Low Vis seems like a worse scenario to recover from and might actually be testing you on ignoring normal ops procedures in abnormal ops.