No, I think you're missing my point.
You're not scrying the person at all. Your just finding all the areas that cannot be scryed within a certain range. Forget about crystal balls, they couldn't do this. I mean using a wish spell. But not to locate a particular person, because that is impossible. Just to locate any areas that are warded only against divination magic.
Imagine something like the wish spell sprinkling everything in range with a special invisible glitterdust and then looking for the dark spots. You have no idea what's in the dark spots, because they are impenetrable to the wish spell, you just want to know where those dark spots are.
So if you have an idea where your quarry is, and get lucky enough to only have a couple areas show up with the spell, and can get to all of them quick enough, you might catch the guy.
You're not scrying the person at all. Your just finding all the areas that cannot be scryed within a certain range. Forget about crystal balls, they couldn't do this. I mean using a wish spell. But not to locate a particular person, because that is impossible. Just to locate any areas that are warded only against divination magic.
Imagine something like the wish spell sprinkling everything in range with a special invisible glitterdust and then looking for the dark spots. You have no idea what's in the dark spots, because they are impenetrable to the wish spell, you just want to know where those dark spots are.
So if you have an idea where your quarry is, and get lucky enough to only have a couple areas show up with the spell, and can get to all of them quick enough, you might catch the guy.