. . . . . And the point about the FAQ is that it does not differentiate between starting a single move, and starting multiple moves.
One of the debates on SG 'years ago' referred to skimmers being set up in dangerous terrain, and the fact that some people did not test to leave the terrain in the first instance, merely testing if they sunsequently landed in dangerous terrain. (I think there was some thought about being carefully set up or something). This was eventually corrected after some carefull thought during which the 'multiple move' action was considered (IMHO it would seem plausible for a skimmer to make a double out of dangerous terrain by first moving cautiously (5cm) and then making a normal move clear of the terrain.)
But the important point here is that neither the rules nor the FAQ state that the skimmer *must* land after every move, this is just an assumption currently being made in this discussion.
IMHO the quintessential difference is that being 'popped-up' means one take-off and one landing irrespective of the number of moves, while being 'popped-down' means multiple take-offs and landings if the skimmer makes multiple moves. But hey, you knew that already didn't you
