This sequence is from a movie and the event lasted less than a second. It came out of the horizon and zoomed past me lower left. I was at 250 feet and stationary. It could be one of the many red tailed hawks that lives in my region.
The Red-tailed hawk can be quickly discounted.
Even when close to the camera and out of focus, they tend to look bird-shaped and brownish.
They fly at a pedestrian between 20-40 mph rather than rocket speeds.
The flap their wings but your mystery object maintains its shape between the 2nd and 3rd frames.
The assumed high speed doesn't stand up to investigation.
If your object was really coming out of the horizon, to be visible with the drone's camera, it would have to be quite large.
Look at the apparent sizes of distant houses that really are halfway to the horizon.
A house passing close to the camera, is going to take up the whole frame before it passes the camera, and a house-sized object flying at missile-speed would attract a lot of attention.
The mystery object can't have come out of the horizon - it must have been much closer.
And being closer, it must be smaller, much smaller.
It's a very small bit of fluff, too small for the camera to resolve at all until it's quite close to the lens.
Imagine something small and light coloured and lightweight, about 1/4 inch across, drifting on a gentle 6 mph breeze.
It's not visible at all until it's maybe three or four feet away, and it's gone past the lens in less than a second.
The illusion that it came from near the horizon is just the coincidence of its location in the frame being up near the level that the horizon is vertically in the frame.