Had this come up in a tournament. Could you play Smoke Cover as a reaction to your opponent playing Turn the Tide?
Turn The Tide vs. Smoke Cover
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.
Had this come up in a tournament. Could you play Smoke Cover as a reaction to your opponent playing Turn the Tide?
Sorry, no.
Smoke Cover reacts to "After another player targets your Ninja Personality" (emphasis mine). With Turn the Tide, you do the targeting, even though it is your opponent's action.
Same with Flanked by Nightmares, much to the chagrin of my own Ninja deck when I play against Spider breeder.
On: Turn the Tide, Smoke Cover