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.
Greetings,
if Moshi Kazue: Mantis Clan • Thunder • Shugenja • Naval Reaction: After a Ranged Attack targets a card: Give the Ranged Attack +1 strength. Forceval 3 Chi 4 Honor 0 Gold 7 Phonor 2
casts Ritual of Summoning: Maho Limited: Destroy this card: Permanently set the performing Shugenja's Force and Chi to 5, and permanently give him Shadowlands • Nonhuman • Oni and the ability, "Battle: Bow this card: Ranged 7 Attack." Lose 3 Honor. Gold 4 Focus 0
is he able to increase his own RA?
Greetings,
if Moshi Kazue: Mantis Clan • Thunder • Shugenja • Naval Reaction: After a Ranged Attack targets a card: Give the Ranged Attack +1 strength. Forceval 3 Chi 4 Honor 0 Gold 7 Phonor 2
casts Ritual of Summoning: Maho Limited: Destroy this card: Permanently set the performing Shugenja's Force and Chi to 5, and permanently give him Shadowlands • Nonhuman • Oni and the ability, "Battle: Bow this card: Ranged 7 Attack." Lose 3 Honor. Gold 4 Focus 0
is he able to increase his own RA?
Yes.
The order of steps when taking an action is Announcement, Targeting, Costs, Effects. Kazue's Reaction is used after the target is declared, which is before she bows to pay the cost of the Battle action.