A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Chuda Hankyu reads: Battle: Destroy this card and dishonor this Personality: Lose 3 Honor. Destroy a target Follower, or Personality without Followers, with a Force less than 5 at any location.
Can a personality at home with a Chuda Hankyu attached destroy a personality with less than 5 force at the current battlefield (provided the player has presence)?
Can a personality at home with a Chuda Hankyu attached destroy a personality with less than 5 force at the current battlefield (provided the player has presence)?
No, Chuda Hankyu's Battle action is on a card in a unit so the unit of the Personality which it is attached to must be at the current battlefield in order to take that action, per the Rule of Location.
If a Battle action is on a card in a unit (a Personality or attachment in play), the unit must be at the current battlefield in order to take that action.