What is this

What is this
Time: 7:05pm
Location: Northwest Georgia (North of Atlanta)

Last night my husband saw something unusual while taking the trash out and told me to come look out the window. I had my phone in hand,  so I attempted to capture it on video.

I almost didn't post this because I don't want to look stupid, but I've never seen an aircraft that appears to have a vertical triangle outline. I would seriously love to know what it was.

A few things:

From my perspective, the lights were to the NNW

Radar didn't show anything, except there was a US Army Blackhawk helicopter South/Southeast of me (so essentially my location was between the lights and the Blackhawk). The army helicopter did a small circle over my area, and at the time the lights moved west, the helicopter went southeast towards Marietta. I'll see if I can also attach the screenshot of the radar website.

The lights were originally moving to the east, then changed direction and moved west. In the video, the very first frames show the lights in a line. And then, as it turns, it looks like it pivots (?) and the 3 lights then form a vertical triangle

I'm aware that flashing lights are an FAA thing, it's the shape that's weird.

The video ends when the lights went out, but there were trees in the foreground, so it may have been behind them. I apologize for trying to get them in focus, I did "lock" the focus on the lights, but because it went behind branches, it kept messing up.