Why did killing Dogen negate the effect of the grey powder used to keep out MiB?

Jakobud March 3, 2010 User blog:Jakobud

MiB wasn't able to cross the grey powder until after Dogen was dead. Why is this? As long as Dogen was alive anywhere in the world, the powder would work anywhere? But not until after his death was it useless against MiB?

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