Blue triangle of lights

Daughter was on the deck looked up and seen the triangle of lights. She called me to come and see but it was gone by the time I made it outside. We both watched the area where it was for about 30 seconds and we both seen a blue flash in the sky then nothing for a few seconds then the triangle of blue lights reappeared for a few seconds before disappearing quickly to the south. There were photos posted on August 30th of this year to this site from this same area and were exactly what we witnessed. Unfortunately our photo was obscured by smoke and lacked any detail.