Colombo, do you have any 130 time? Curious about systems, etc. Being pretty much empty, except for fuel and pax, it would seem there would be excess power available. The video seems to indicate the classic low altitude, stall, spin scenario. Will be interesting to hear what caused the uncontrollable roll.
I wish I had some Herc time.
My take on the video is they were nose low with a high sink rate which means to me they were very slow.
The uncontrolled roll at the end looks to me like a classic spin entry. It looks like they were in a slight left turn, I think they had a power loss or prop problem on the left side and unfortunately they failed to do the basic task of flying the airplane.
I can't find anything online but I have a memory of someone doing a single-engine touch and go with a Herc many years ago to prove it could be done.
The Herc is one heck of an airplane. As a young paratrooper I was impressed with how sharply it could accelerate and decelerate inflight, sometimes so much that it would cause troops to fall to the deck as we waited to jump. We would come in Nap of Earth and a couple of minutes out they would climb steeply to our drop altitude of 800-1000', level off and slow quickly to our drop speed of about 115 knots IAS meanwhile we're standing up, with 100-200 pounds of gear strapped to us and hanging on so we don't fall down (if you did you were pretty much like the turtle on it's back!). Fun times.
