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Just a gameplay feature like the possession visibility. You can be sure such teleports wouldn't feature in novels or movies 
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Right. This is probably just another symptom of the crunch-time on MO. Well-played.
As for the birds, don't we run them off and find them returning? They aren't bound by natural physics, so I think it might be harder to get rid of them than just running them off. Probably some kind of portal suppressor would be required.