Japan's Kaguya lunar orbiter

On June 10 the Japanese probe named the Kaguya lunar orbiter was purposefully crash landed on the moon's surface.

[link]

The Anglo-Australian Telescope captured images showing a bright flash at the time of impact.

My question is:
What was the bright flash composed of?

Was it simply a could of moon dust thrown up upon impact and if so why was it just a brief flash instead of lingering for a few moments.

or

Was the bright flash the result of the 3 ton probe impacting the surface at 4,000 to 6,000 mph and generating heat and light as the forward momentum was converted to friction and energy.

Meebee oxidizers and propellants????? POOF!!!!!

That's what I was thinking, there is also a bit of afterglow visible so several seconds of observing have imaged perhaps the expanding debris cloud.

Yes, that's a good point. there should be enough oxygen in the propellants to ignite given enough friction.

I was wondering if anyone happens to know if that area (of the crash) has been re-imaged (by lunar orbiters) or photgraphed through a telescope recently?

The area of the impact is now completely lighted (full moon).