Well, Boba used this grappler weapon on our poor Jodo Kast when he stabbed him in the back in an unprovoked attack. (got the old Jodo hackles up there for a sec 
)
At first I thought it was like the prepro left gauntlet thing but it has a an attachment piece that he sticks on the pole.
Of course, he follows that up with a toxic dart. Maybe he inherited that from his father after he did in Zam.
