For some reason I cannot post on the previous thread.
It all comes down to "you get to initiate one thing." So constant effects that do not initiate can help get beyond the terminal state, but passive effects (or multiple triggered effects) that must initiate separately cannot.
It may be even less : "you get to resolve one effect" - excluding the initiation and the save/cancel step that stem from the initiation of your save effect.
The terminal state must be immediatly removed by an effect, excluding any other possible initiation. That includes any other save/cancel effect that could occur within the very Save/Cancel window that is opened by the save effect (Maester Aemon's as per example above). You could perfectly imagine some save/cancel effect that would stand him again, putting him back into a terminal state and retroactively making the trigger of his save ability illegal in the first place.
Worth noting : the FAQ just say the resolution of an effect is considered to check if the save initiation is legal, not its initiation.
A card cannot be saved from a terminal effect
unless that saving effect also removes it from
the terminal state.