In this video, the teacher explains how to respond to an open-ended prompt by combining wording from the prompt, your answer, and evidence. The teacher guides the students through the steps of analyzing the prompt, finding evidence, judging the evidence, and preparing and finalizing the case. The importance of including evidence in the initial response is emphasized, and the teacher provides an example of a weak response without evidence and a stronger response with evidence. The video aims to teach students how to write a strong and well-supported initial response to a prompt.