Seems like atmospheric intuition.

I'd expect high velocity dust to diffuse rather quickly in near vacuum.

The moon’s escape velocity is 2.38 km/s (5324 miles/hour), so it just depends on whether or not the material reached escape velocity or not.

In my layman opinion a dust cloud would at very least stick around for much longer than the duration that we see this glowing last. There has to be something else responsible for the flash imo.