Final answer:
The structural element shown in the parentheses is stage directions. Stage directions provide information about what needs to happen on stage.
Step-by-step explanation:
The structural element shown in the parentheses in the excerpt is Stage directions. Stage directions are used in a written play to provide information about what needs to happen on stage, the appearance of the stage/characters, or the actions and movements of the actors. They are usually enclosed in parentheses and italicized to visually distinguish them from the dialogue.