I've seen this gesture somewhere before:
The origins of that salute lie in the history of one of the most notorious Muslim leaders of the twentieth century: Haj Amin al-Husseini, Grand Mufti of Jerusalem.
Radical Muslim leader, and organizer of anti-Semitic violence in the British Palestinian Mandate, murderer of his Muslim enemies and moderates. He was expelled from Palestine in 1941, the Grand Mufti spent the war years as Hitler's guest in Berlin.
While there, he had a hand in the furtherance of the Final Solution, was a personal friend of Himmler, and organized an all-Muslim unit in the SS which massacred thousands of Jews and Christians in Bosnia.
Captured by the Allies at the end of World War II, he escaped from French captivity in Paris, fleeing to Cairo. From there, he spread his special mixture of Muslim religion and Nazi politics to other areas of the middle east. The Grand Mufti is considered to be the ideological godfather of Yassar Arafat, Gamal Abdel Nassar, Saddam Hussein, and other Muslim/fascist dictators of the latter half of the twentieth century.
