It's a fan-modeBe careful when you're trying it though, it's a tight fit trying to get Skystalker's arms in there - but you should be able to do it without damaging any plastic.
Also, if you're thinking of getting a second Skystalker you can do this:
Image via Seibertron: http://www.seibertron.com/energonpub...8584&mode=view.