No gaff required. (but what is that giraffe DOING?)

Since encrypted radios have had auto destruct features all along, wouldn't such a feature be expected in TDE?
Since Sarah was still alive after John and CW jumped, we can just assume that Weaver didn't set the auto-destruct sequence.

Never mind that there was a "not really" nuclear plasma rifle ("Hope") in the bank vault bubble when the TDE was activated.