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.
From the comprehensive rules: Tactical Battle: Any number of times per turn, discard a card and target one of your Tactician Personalities: Give him a Force bonus equal to the Focus Value of the discarded card.
Can this action be used on a bowed Tactician? It does not call for a straightened Tactician to be targeted.
Yes, it can be performed by a bowed Tactician, for the stated reason.