Answer: Change some of the wording and work cite it.
Explanation:
I do this all the time and never get accused of plagiarism.
The words in the brackets are telling the actors what to physically do, meaning it would be a stage direction.
It isn't dialogue because that is a conversation between two people.
It isn't dialect because that is how a person speaks. There is no speaking in the brackets.
It isn't narration because it isn't spoken allowed for the audience.
It isn't a description because that is too broad a term more often used for emotions.
In many of Franz Kafka's stories, he utilizes the theme of (C) Alienation.
He talks about alienation from society, from others around us and even from our true self. He sees society as something which alienates us from our own selves and does not serve as a sustenance to nourish our true identities.