So that would explain why you--your future counterpart--returned to this area to continue your research. We were led to believe that those chosen to live in the future enclosure, Luceti, were those with a particular ... trait or aspect that made us resilient to the amount of Shifting experimentation done.

[Add all of that together, and it seemed highly likely that Twila was an even more troublesome force before the barrier could have potentially "tamed" it.]

Is there some reason why you would risk sealing Twila underneath this place, when it's become such an important base? Was there no other option?