Diamond, hard to visualize, low hum but other person didn’t hear it. Got right above us and moved very fast. Ex military, moved strange

I was walking with someone I was having a conversation with. They stopped at their vehicle, and I was semi waiting for them. Just over the top of the truck, something passed above us. Friend in the truck didnt hear anything and I even called to him once, to which he didn’t respond.
It was shaped almost like a kite. The middle was black. There was “something going on” because it was blocking out the sky behind it, and it was so close I knew there was detail there, but my brain literally could make sense of it. I I also couldn’t tell if I was looking at it from its side or it’s belly. Like my eyes wanted to make it be flat, but it didn’t know how.
There was 3 lights, that looked like they could be regular ass lights. But there was like a “creamy” hue to them. I DID HEAR A HUM THOUGH, I know so frequently ufos are reported as silent. However the hum was very unsettling. It sounded like a broken subwoofer, only I could just barely hear it.
So now I’m yelling for this guy I’m with to look. He comes over and he sees it flying away from us. It seemed to emit s pinkish hue and We determined it’s flying like \ . He also can’t make sense of it. It was fast. He didn’t hear it, nor me asking him like a crazy person to come look at it. But that seemed to shake him a bit more considered how gosh darn low it was.