[quote=@Onarax]
Typo, I meant staff and nunchuck. 
[/quote]

Okay that makes more sense.

The fighting style between them is vastly different but from a logistics point of view the weapons aren't the dissimilar. The staff would disconnect at the halfway mark and those two pieces would again disconnect but have chains attaching them. I think you might even be able to construct something like that in reality never mind RWBY physics.

[quote=@Guess Who]
<Snipped quote by Prince of Seraphs>

A sword to a scythe isn't that big of a stretch, Bloodborne seemed to have something similar:

[img]http://i.imgur.com/YMHDpMe.gif[/img]
[/quote]

That sword is already basically a scythe without a handle, plus he's attaching it to a handle on his back. I don't think the design of Qrow's sword would permit it turning into a scythe very easily but I suppose that's just me.