Link to the video, for those who missed it:
[video=youtube;RUjH14vhLxA]https://www.youtube.com/watch?time_continue=1725&v=RUjH14vhLxA[/video]
I didn't see it till over an hour after the flight.
After the landng b, it did seem to "up" a bit, in a relative sense. Alhough for an ASDS landing, they don't really need to do that AFAIK. For an RTLS landin,g they absoultely have to do that, the landing burn leaves the booster in a ballistic path that would impact miles out at sea, the grid fins have to crudely "glide" it (in relative terms) to extend the path to cross the coast and align with the landing pad. So, they may be doing the same thing for ASDS landings.
After landing, what little live video there was, it looks like RP-1 from the Falcon booster spilled onto the deck, during shutdown. I will say as I think about it, they do not want the engine to shut down oxygen-rich, they'd want it to shut down oxygen lean. So the flow of liquid oxygen is proablt stopped a tiny bit before the RP-1 flow is stopped. But the previous landing, apparently a lot of RP-1 came from the Falcon booster after shutdown.... somehow, allowing that fire to flow across the deck to the "Roomba" corner. Today, seems a bit of a fire but hopefully it ends soon after the video went away. IIRC there are water cannons pre-aimed to spray water to combat fires.... which now brings to mind what happened last time, or if they have not been using them for some reason (BTW - the water would be fresh water from the ballast tanks, not seawater).
So, Koreasat 5A was launched successfully, on its way to an eventual geostationary orbit. SpaceX's 16th flight of the year.