Black changing shape with halo hovering over Williamsburg Brooklyn

Williamsburg, Brooklyn, NY - May 16th around 7.30 pm  My girlfriend and I were hanging on our building's rooftop, our little dog running around. It was a cloudy and windy day.
 I noticed in the sky, maybe a mile away up, a black shape floating. At first, I did not pay attention, thinking it might be a black plastic bag, or a drone. But as we kept talking, maybe 30 mn after noticing the shape, I realized that it did not move, or at least barely.
 My gf confirmed that she has not seen it move. And by move, i mean moving up or down, left or right. It was static or moving very slowly, like hovering.
 I decided to grab my camera and zoom in, hoping to confirm it was a plastic bag or a drone. But the video got me confused: we see a static black shape that is constantly changing its shape (boomerand shape, round shape, and a similar shape that we see in one of the recently released video from the goverment).
 The thing that confuses me is: when I zoomed in, I noticed some kinda of "pulse" from that shape (you can see it on the video) that even got the camera unstable for a second (kind of like energy released around). You can even see a halo around the changing shape.
 The shape then kept hovering above Williamsburg, moving very slowly from left, going back to right, before disappearing up in the clouds.
 I am not saying it is a UFO. But I would assume tht an empty plastic bag, given the altitude and the wind that day, would have followed a different and unpredictable path. That thing, whatever it was, was rotating on itself, and not following winds at all.
 I will be attaching the 2 videos taken - I apologize for the quality.
 Best, Sofiane