Very sad news and I hope those who attempted to assist will not suffer as a result what they witnessed.
it has echoes of my (then) best friend's death in 1988. He span his Bulldog into Southport beach and survived the impact. The first responder was an off duty fireman but he was confused by the two harness releases (seat and parachute) so ran to his car a few yards away to get a knife to cut the straps. When he got back the aircraft caught fire and he had to watch Mark burn alive.
ASN Aircraft accident 02-MAR-1988 Scottish Aviation Bulldog T1 XX712