Hi,
One important fact of the famous and disastrous climb of Nanga Parbat in 1970 where Reihnold Messner lost his brother Gunther, is that the expedition leader Herrligkoffer erroneously fired a red rocket which indicated bad weather, instead of a blue which would have been appropriate.
I do not accept the explanation that it "was a mistake". Such mistakes are not made on expeditions at this level. There must have been a reason. (Maybe one answer is in R. Messner's book, I think it has the title "The red rocket ...". Unfortunately I have not had the opportunity to read it.)
/ycc