Considering that a not very sociable magus just tried to explain to them that their masters had been seized on witchcraft charges ( Investigating Creatures? ), and then killed their autocrat and run off with what he could salvage, reasonable covenfolk would look for independent confirmations of the magus' claims, and then start figuring out what their fate will be if they stay.
But if no authority figure to organize a decision and its execution is left at the covenant, I should also assume that some covenfolk would still stay behind - not a reasonable but a plausible and understandable reaction.
Kind regards,
Berengar