I enjoyed Paul as well and I remember that he and Terry had a genuine friendship. A number of us, liking and respecting both men, would refer to them as "the Heim brothers" (Fretheim and Sponheim).
We did the same. It was my experience at Luther that all of my professors genuinely liked each other even when they didn't agree. I took a number of team taught classes. Forde and Nestingen for conressions was another favorite, as was a cross disciplinary class taught by Harrisville and Sundberg
I took "Giants" (short for I foggily recall "Theological Giants") with Harrisville (my adviser) and Sundberg the fall ('86) of my senior year. Essentially it was a retracing of Biblical exegetes and expositors from the Reimarus and others in the 1700's up through Bultmann, Barth, and Kaeseman in the 20th century. The key question was whether the particular theologian/Biblical scholar actually exposited Scripture or domesticated Scripture (most often by making Scripture and its interpretation a vehicle for a philosophical exposition instead of Biblical exposition, e.g Bultmann's appropriation of Scripture as a vehicle for existentialist philosophy, a hard admission for Roy to make but which he did). For the most part, most of the professors liked each other or at least respectfully got along--but there was conflict as well, particularly in faculty discussions/debates and battles over granting tenure; it also reflected conflicts between those supporting the merger process leading to the ELCA and those with deep reservations about the forming of the new church). Of course that sort of theological/ecclesial back and forth was not new, as I learned about the bitter divide of an earlier generation between Herman Preuss and George Aus. Theological disagreement could and did result in the ending of friendships and rise of personal enmities. I never really detected that in Terry--he was politically adroit and adept, trying to find a middle ground. At least in his classes (which is where I really only knew him), he was respectful of his colleagues and didn't air complaints or grievances publicly. I just remember his kindness and generosity of spirit in his approach to those taking his classes.
