Ask HN: What did SpaceX rocket almost hit just before reentry burn?

2 pointsdiggernet1 comment

At about 36:00 in the webcast, the onboard camera shows something fly past the rocket, causing one of the announcers to gasp. What was it?

http://www.watchframebyframe.com/watch/yt/URh-oPqjlM8/2160.933193

Ice?

I think what is happening is that the optics of the lens on the camera make it seem like it comes from well below the rocket itself.