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.
A player, 27 December 2009
I am playing a battle with an unbowed Central Castle as my stronghold and then my personality is challenged to a duel. I focus once from my focus pool, then strike. As my focused card is discarded, can I react with Central Castle and draw a card, as suggested by this ruling?
**edit** From the CR glossary:
Discard
As a verb "discard" means:
1. By itself, referring to a Fate card: To remove a card from one's hand and put it in the discard pile. 2. By itself, referring to a Dynasty card: To remove a card from one's Province and put it in the discard pile. 3. A card may also be discarded from other areas than the hand or Provinces, going to the discard pile, but this must be stated explicitly. See Areas of the Game.
Zen Faulkes (rules official), 27 December 2009
I am playing a battle with an unbowed Central Castle as my stronghold and then my personality is challenged to a duel. I focus once from my focus pool, then strike. As my focused card is discarded, can I react with Central Castle and draw a card(?)
No. The linked ruling was corrected; the discard is a rulebook effect. This has been extensively clarified in the rules wiki today.