Twilight Hue
Twilight, not bright nor dark, good nor bad.
There's no way to verify NDE experiences ever occur when the brain is put in stasis and activity stops.One point is that things are also known remtely like the sister in the waiting room or gym shoe on the roof. In the Pam Reynolds’ case the brain was shut-down.
I don’t know that ‘proof’ is possible in the strictest use of the word ‘proof’ as consciousness can not be directly observed.
It's pretty well certain those events had transpired when she started to experience brain activity as she slowly regained consciousness after the procedure.
NDEs can only occur when brain activity is active.