Bows are non very suited for close combat, as underlined by Arms Law, but occasionally you could be caught unaware and be near an opponent with your bow in hand. How do you handle an attacker that wants to hit specifically the bow of a PG (or NPG) in order to break it?
It's an encumbrant object, it's not like aiming to the heart, so I would say that's a legitimate action and maybe not a particullary difficult one, but I can't find a ruling for this.