Final answer:
The high school counselor assumes the role of a collaborator by actively listening and empathizing with the teacher's classroom concerns.
Step-by-step explanation:
When a high school counselor engages with a teacher about disciplinary issues by listening and empathizing with the teacher's concerns, the counselor takes on the role of a collaborator. By assuming this role, the counselor is working jointly with the teacher to understand the challenges faced in the classroom and help find solutions. This approach is conducive to problem-solving and fostering a positive relationship between the counselor and the teacher.