https://www.youtube.com/watch?v=ldwWfQb4Odo
The second security camera view (starting after halfway through this video) shows a lot more.
It appears level when it enters the view at the top (not an uncontrolled load shift) and though it appeared to be slowly losing altitude it didn’t look like a full stall, nor slow enough for one.
I’m still wondering if those flaps were set to zero too early, but I don’t know how far from the air strip this was. Perhaps a power loss.
The maneuver at the end is just nuts though. I can’t imagine the rationale for it being intentional unless the pilot decided the entire area was far to densely populated and overdeveloped for a horizontal makeshift crash landing and just sacrificed the plane and the crew for the sake of the people on the ground.
Video here: https://www.youtube.com/watch?v=ldwWfQb4Odo
The second video is much more revealing. It shows the 130 having a distinct yaw to the left as it's course changed about 70 degrees without the bank you would expect with that type of turn.
At 2:45 to 2:51 the plane spins on the yaw axis. At about 2:46 the flat turn begins to be noticeable. At 2:49 it almost has the appearance of a flat spin. By 2:53 the course has changed by about 70 degrees and the plane takes a distinct nose down attitude. Then they spin in.
That flight profile points to hard over rudder or dual engine failure on the left wing, either catastrophic at climb out speed..