In the course of the discussion, we described how careful one should be when describing the dynamics of Christianity. As seen during the fall of Constantinople, despite a “common enemy” being on the verge of conquering a major Christian city, the Orthodox and Latins refused to compromise on their doctrines or send aid. The tension was so severe many Orthodox clergy even preferred a takeover by the Ottomans to that of the Latins for at least theological autonomy would be guaranteed by the former.

XREF: Connects to broader Christian schism history and Ottoman millet system that granted religious autonomy to subject communities. Pays off: "Orthodox Byzantines preferred Ottoman rule over papal supremacy"

Ali Qureshi, The Fall of Constantinople, loc. 60