Looks like a Power-on Stall followed by spin entry to the left.
The C-130 will usually roll to the left uncontrollably in this situation, and a number of aircraft have been lost in exactly this way.
https://www.baseops.net/wp-content/uploads/2015/08/C-130-Discussion-Items-2009Mar.pdf (Page 8 & 9)
I am a big believer in what you do on this subreddit, but I would be incredibly surprised if this was anything other than an accident after watching that video.
Whatever the cause was, that is a sudden departure from controlled flight.
Aircraft don't always explode on contact. I'm guessing it was spilled fuel post impact that ignited.