When is a circuit "closed"?

Just got back into Unchained, long time player of OMD, I was placing some walls to channel the orcs and it stopped me saying the new wall would close the circuit. I'm assuming that means that should the wall have been placed it would have sealed off the spawn point from the rift. Only thing was it wouldn't, not in this one case at least. There was clearly a way for them to get around. So what actually declares a circuit as closed, and if it is closed, so what? Why can't they just brake down the first barrier they come to and open it up? I think I know the answer to the 2nd one, but I'm still curious to the "what makes it closed" question. Thanks.

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