You’re gonna have to take my word for it that this gif didn’t do the scene justice. To get into Tumblr’s 3mb size limit, I have to record at 20 frames per second. Meanwhile, most shows are animated at 24… though I think RWBY is 30 frames per second. A lot of detail is lost here. In the episode, it’s a lot less random looking than this made it look.
So. It seems Sun has, of course, a bo staff. That is also a nunchaku.
And the nunchaku are flintlock pistols.
We have a winner for RWBY’s most absurd weapon, folks.