[Varyon]

Honestly, this seems like just a party trick, at most covered by some sort of Hobby Skill or similar. The GM might allow it as a complementary roll for Intimidation or the like. Force Sword Art might also include it - I could see something like this as part of a kata, perhaps (I think I've read about some staff/spear kata that have a "roll over the arm" component, albeit not nearly as pronounced as this).