the rules state in matter of support "if the defending player declares no defenders, you may declare any number of your own eligible characters as defenders to that challenge". the question is: is zero covered with "any"?
the specific situation was: player A attacks player B with a power challenge in which player B doesn't declare defenders. player C supports player B due to titles and declares support with zero defenders in order to lose and trigger some effect after losing.
is he allowed to do so?