[samlittlewood]

I wonder if they considered showing this person (or at least people on that ISP or region) custom content?

Forking the entry so that they could carry on editing in ignorance would, I imagine, be a rather large challenge, but just hard wiring a divertion to some sort of explanation might have been feasible.

[invisible]

I think a better solution would be to allow elevating a page to non-anonymous users only. That way when situations like this arise, they can make a page "user only" and create a line of communication with the person on the other end.