Just a thought ,or two;we don`t know what the `student`s experience is ,or what part of the training syllabus is the exercise,but it looks very much an early `general handling exercise`,at medium level,maybe a bit of aeros plus maybe a `demo `forced landing`....possibly overhead the airfield at Foley...
It could be that as part of the exercise the prop may be feathered(demo),but possibly the I/P and/or student are incapacitated/lose comms,someone recovers and turns back towards Foley ,(approx 3nm NE),but enters a spin,unable to recover from <2000ft...maybe the engine had failed,or failed to relight/unfeather....?
Lots of maybe`s/possibly etc,so we may never know...do T6s have a CVR/ADR as standard....perhaps someone from Valley may wish to contribute...?