Trim Stab, I don't think CM ever picked an argument with you. He just told you that you were wrong to take the debate in that direction at this stage. If he hadn't, I would have.
Yes, the decent is within the bounds of what little is know of his DA from the document you quote for reasons that have already been covered here.
You can be as interested as you like in any legal process, but going on line and saying you wonder if the pilot might be persecuted is rather like going to a F1 race and saying that you wonder if you might see someone crash - simply distasteful and pointless as you have already answered your own question. Investigations, Police, CPS. If you knew all that, why ask?
It still seems to me a perfectly legitimate question to ask why he started to pull up into a vertical aerobatic manouvre at 45 degree to the display line at 200ft.
The AAIB report describes his DA as:
a valid Display Authorisation (DA), issued by the UK CAA, to display the Hawker Hunter to a minimum height of 100 ft during flypasts and 500 ft during Standard category aerobatic manoeuvres.
Cap 403 describes Standard category aerobatics as:
6.1 Standard aerobatic displays
Lines – Mainly horizontal or up to 45° climbing/diving lines in normal flight.
Turns – Turns through 90° to 360° in normal flight.
Spins – Erect Spins of one turn, with entry and exit in normal flight.
Stall Turns – Stall turns with normal entry and exit.
Loops and Eights – Inside circular loops with normal entry and exit.
Combinations – Half an inside loop followed by a half roll (‘Roll off the Top’.) Five eighths of an inside loop combined with a half roll on diving exit Line (‘Half Cuban 8’). 45° climbing line followed by a half roll and pull through to level flight (‘Reverse Half Cuban 8’)
Rolls – Slow, aileron or barrel rolls on horizontal line, or where combined with a combination manoeuvre listed above, on the diving or climbing line.
To quote from the AAIB preliminary report:
executing a Derry turn2 to the left and then commenced a descending left turn to 200 ft amsl, approaching the display line at an angle of about 45o. The aircraft then pitched up into a manoeuvre with both a vertical component and roll to the left, becoming almost fully inverted at the apex of the manoeuvre at a height of approximately 2,600 ft amsl.
So was his trajectory at 200ft at 45 deg to display line a "low pass"? Or was it the start of a Standard category aerobatic manoeuvre, below his DA of 500ft?