Fair enough. I still see it as more of an effect of time than place; if you were standing in the room when they walked in, you wouldn't need Correspondence for the effect. Further, I don't really see it as a proper "time trigger" or even "location trigger", the trigger comes from Mind. Since I could use Correspondence 2/3 to send you the message *now* but from *far away*, I'd let someome use Time 2/3 to send the message *later* but *right here*.

But, I will cede that it's reasonable to treat it as a ward too. Different paradigms, different ways of doing similar...