That second video reminds me of when I was at Ft. Benning for Airborne training.
It had rained, so the training day (tower week) was cut short.
I was coming back from the store near the Airborne barracks along the concrete walkways in back of the barracks.
These two Navy Seals see a couple of four inch puddles on top of the concrete walkway blocks. They immediately begin to strip off their pt. uniforms and began to belly flop and try to swim/skate across them.
Bravo company, who was in the 30 ft. tower week-sawdust pit week came up around the corner and almost marched right over the top of them.
I made myself scarce.