[Mat_Helm]

In the video the C-130 is yawing and not centered on the ball. Pilot is applying more power on starbord side and also losing airspeed. He pitches down but torque rolls to the port side. It could have been a port engine reverse pitch runaway prop failure and with his weight and trim could not control the roll. More nose down would have helped, but he may have been looking for a place to set it down before pitching his nose down and waited to long trying to keep it in the air. Sad to watch.

[Steve Van Doorn]

"It could have been a port engine reverse pitch runaway prop failure and with his weight and trim could not control the roll."

that makes sense.

Here is an example of reverse pitch:
https://www.youtube.com/watch?v=Q3M6AZel0hk