Shelly and Brooke were best friends until Shelly started dating Evan. Shelly started ignoring Brooke's phone calls and spent all of her time before and after school with Evan. Brooke was hurt that Shelly forgot her birthday, so she confronted her about it at school. Shelly was not interested in talking with Brooke and turned to walk away from her. Brooke grabbed Shelly's arm, and Shelly turned around and pushed Brooke away. They started shoving each other but were separated by a teacher before things escalated. They have been sent to the office for peer mediation. How would you lead Shelly and Brooke through this difficult situation using the 4Ds of a Difficult Conversation (Define, Defuse, Discuss, and Decide)? Write a three-to-five-sentence summary of the discussion.