Roseman is really into teamwork and leadership. In fact, part of the interview is a team activity in which you learn about other applicants in your group and then introduce them to the rest of the applicant pool (and any faculty who happens to be there). I don't know if you have any specific questions, but it was a pretty laid back interview. They'll ask you about experiences working with a team, possibly about leadership experience. They might ask what hardships you've had to overcome. It wasn't super stressful.