Yes, or that it proves that there seems to be an interaction between consciousness and the "reality" we can measure with scientific instruments.
Another, more detailed, proof along with a theoretical framework is in the book: Conscious Acts of Creation. https://www.thefreelibrary.com/Conscious+Acts+of+Creation%3A+The+Emergence+of+a+New+Physics.-a0163336453
I see no evidence of a handoff. HRC's envelope fell out of her program. LB probably had it the whole time and had to wait until then to share it with Jeb because he was a row behind.
Also, with what we can see of the SS agent behind GWB he definitely is not closing the gap to GHB (who is holding a notebook in his left hand), standing in front of his chair.