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**Warning! This question contains spoilers; most are tagged, but the
question's very substance is itself a spoiler.**

In one of the final scenes of _Digimon Tamers_ , the entire cast is seen
together:

> The kids are standing around the portal between the Real World and Digital
> World, and their Digimon--as well as Calumon and Impmon--are sucked into the
> portal to return to the Digital World.  
>  
>  Following this, after some time had passed, Takato returned to Guilmon's
> hole under the "house" in the park, where he found a portal to the Digital
> World, which we are to assume works just fine.

_(A more expansive explanation can be found[in the last two paragraphs of this
synopsis](http://digimon.wikia.com/wiki/Such_Sweet_Sorrow#Synopsis).)_

Firstly, how can the Real-Digital barrier—which Henry's dad says has
"stabilized"—regress the Digimon? A barrier, by definition, should act as a
split between the worlds, rather than a "vacuum". And second, if the barrier
is so stable, why is Takato able to see it open again?


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digimon-tamers
What happened to the barrier at the end of Digimon Tamers?


In terms of the Digimon regressing:

> It seems to have to do with their initial bio-emerging being undone. And,
> since Digimon in the real world are synthesized false proteins, it would
> make sense that, without the Digital World being properly connected, their
> physical form would not be able to remain, so they reverted their evolution
> and returned to the Digital World.

As for the portal appearing:

> Shortly before we see it, we see Takato running through the park, when a
> [Digignome](http://digimon.wikia.com/wiki/DigiGnome) flies overhead. Since
> they are known to be able to grant wishes, in both the Digital and Real
> Worlds, it would make sense that it granted Takato's implied wish to see
> Guilmon again, opening the portal for him.


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