How did Femi Osofisan involve audiences in the ending of Once upon Four Robbers?

In the play Once upon Four Robbers (first performed 1978), the Nigerian playwright Femi Osofisan utilizes a provocative open-ending to engage the audience directly in the play's moral dilemma. At the conclusion of the performance, the audience is asked to vote on whether the characters—who are armed robbers—should be punished or released. This technique reflects Osofisan’s broader approach to dramaturgy, which often seeks to challenge and involve his viewers in the political and social issues presented on stage.1