When you stretch the body of Fatum-1 horizontally, the wing unit will slide coherently. The most difficult feature in the development of this MG, and there's no trouble seeing why as well.
There's a big difference between the proportion of movement between the body and the wing actually, i.e. little horizontal stretch, very wide wing movement. It's the opposite of the feature on Destiny: wide wing movement, less linked movement of the thrusters beneath it. Not to mention the direction of movement for both is different as well. Fatum-1's feature might make Strike Freedom and Destiny's backpack's linked movement seem simple, since the direction of movement for the later two are the same for their wing units.
Also, for those who are still uncertain about the extra beam part included in this MG, it's actually the shorter beam blade for the leg. Only one is included, so you'll have to use the longer beam blade for the other leg. This shorter one is probably for the action pose against Destiny.
All images from Gundam Dot Info.
