As I've said above the statement from Marty at 14 43 45 mean absolutely clearly (in french) "Shut down the engine Two" And Ive yet said that's even sligthy impatient.
As a native French speaker, I must say I do not share your sense of clarity. At least, not from the words alone. Your interpretation is certainly possible, but much would depend on tone of voice. Have you heard the actual tape, or are you just going from the transcript? For example, try reading the same words in an alarmed tone, and they come across as "what the $*^%^ are you doing?"