Fireflies... yes, huge ones.
Very interesting. I saw something slightly similar to this a week ago. I was walking home from a friend's house, and I was even thinking "Good night
for UFO watching" -- it was warm and there was no fog.
What I saw matched your description of the "squiggly" movements --- although mine did not stop on a dime, as you've describe. Mine was yellow, and
I still feel it very well could have been a flare, although it was very high in the sky --- and I live in a small damn town, where people don't just
shoot flares off
Lasted about 3 seconds, maybe four before disappearing. Kind of in an arc pattern. Strange was how it disappeared, or had no sparks of any kind. Then
again we see strange things all the time in Northern California.