I think after many many posts back and forth, all I will say is you seem to have and be very very attached to dome fifferdnt PHB thsn I use and others here may use. If that PHB and whatever its rules are working for you, that's great.Wow a lot of words and you said nothing to actually counter my point. You just tried rewording it. Of the trigger is for an OA is "leave your threatened space," what did I say was wrong? If the trigger for shield is "when attacked," again, what was wrong with what I said, because you literally just said the same thing.
But it's not the one commonly in play.