Roman said:Can anybody with more experience of 4E rules tell me whether my conjectures are correct?
Sure. They're not. And I haven't played the game!
The way to get to frips with it is to rethink the terminology, as I said above. "Save" doesn't mean the same thing any more. You have to ignore the fact that the word "save" is used. Think like this:
4E "Attack roll vs. Ref/Will/Fort" = 3E Saving Throw (i.e. takes place at the time of casting, one roll, dependent on target's scores).
4E Save" = 3E duration roll (i.e. takes place if the above if failed, sometimes affacted by victim's abilities but not always).
I LOVE that duration isn't generated beforehand. Now nobody knows how long an effect willl last, and nobody has to keep track of it. Just roll each round to see if it has ended. Adds some unpredictability to the durations of spell effects, makes it less easy to plan exactly round a specifically known duration, etc.