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, 3 November 2009
Referencing this thread (viewtopic.php?f=59&t=79874)...
Unpredictable Strategy Battle: Target a unit, and another unit controlled by the same player at any other location. Switch the two units' locations. Straighten them if they moved.
Nerve Strike Battle: Bow your target Monk: Target an enemy Personality with equal or lower Chi. Reduce his Force and the Force of each of his Followers to 0. Cards in that unit may not perform actions until this battle ends.
Does Nerve Strike cause Unpredictable Strategy to fail?
Please advise.
Zen Faulkes (rules official), 3 November 2009
Does Nerve Strike cause Unpredictable Strategy to fail?
Time to hit the FAQ again: http://rules.l5r.com/CE_FAQ#What_performs_an_action.3F
"Personalities and Followers perform actions printed on them, and actions where they are targeted between the two colons of an action." Does not apply.
"Actions on Items or Spells are performed by their Personality." Does not apply. Which leaves...
"Nobody performs an action if it targets only as an effect (that is, isn't printed between two colons) or doesn't target."
There you have it: Unpredictable Strategy not performed. Therefore, attempting to use an effect that prevents cards from performing do not do anything.