The playwright wants to illustrate fear to the audience because they fear the anger of Dryas and so he was put into prison for that reason, but maybe sadness as well because of the reason he was send to jail.
It is a short personal story. (which is usually amusing).
Answer:
To organize the text and to make the text easier to read
We use subheadings to give readers a sense of what they are reading, not to make them think the work is legit, and not to introduce new information or point out important facts. We want readers to know what is coming, and what they are going to read so we don't waste their time
