Ishan, being an actor, reports to the director, Yamini, or to the assistant director when Yamini is away. The playwright, Omkar, is responsible for writing the script, but actors such as Ishan do not report to the playwright. Therefore, if the theater group decides to change the script, Ishan would need approval to use the new lines from the assistant director because Yamini, the director, is away and the assistant director is taking over her duties. Omkar may write the changes to the script, but it is not his role to give the actor approval to use the lines; this remains the director's or the acting director's job. Since the assistant director is the one currently directing the play in Yamini's absence, Ishan must get the approval from the assistant director.
In a small theater group, Yamini is the director, Omkar is the playwright, and Ishan is an actor. Ishan only takes instructions from the director or the assistant director, who is filling in while Yamini is away. The assistant director is not Omkar. If the theater group decides to change the script, who would Ishan need approval from to use the new lines? Provide a very brief response.