Studying the few pictures taken shortly after the impact when the 44 was on fire.
On this evidence it looks like the fuel cell did not spill its guts, or if it did there was a very low volume of fuel to spill.
It is unlikely two blokes in shorts and garden hoses could extinguish a raging avgas fuel fire.
Poor crash-worthiness of frame, seats and proximity of passenger heads to unpadded interior is not uncommon in light aircraft.
At least we are seeing fewer catastrophic post impact fires on R44s..
mjb