I don't know, the video didn't show me that the objects traveled at any speed -- that's from the pilots testimony, but maybe it appeared to move against the backdrop as they were banking around it. I would expect fighter pilots to be a good judge, but maybe you lose some sense of velocity when you're surprised by something you haven't seen before.

Separately, radar operators saw something they didn't understand. It could have been noise as they are now looking out for tiny drones and very small radar signatures, they have sensitivity turned way up. Sometimes you see things that aren't really there.

I'm honestly going weather balloons on this one.