I had an enquiry in my recent game against Richard at Bristol.
It had no effect on the game, and I learnt from rRchard the finer points of the rule; so happy that his explanation of the rule is the correct one (also appreciate that every time he palys me hes sober and I'm usually on my seventh pint, so do appreciate his patience..)- but it does anger my small logical part of the game (the bit that forgets about the fact that forgets about the fact taht it was a battle between spoace Egyptions and aliens...)
This was that most joyous thing, terrain and skimmers.
So the rule is that skimmers must be closer to the terrain than their target, or they can't see the target.
It also works in with the 'can't see 10cm into the terrain.
In this case I had a unit that was sitting 'arse out' so to speak. They were half into teh terrain, thus ensuring they couldn't be seen by a unit on the other side of the terrain (10cm in).
I had always envisaged that this would also mean they were closer to the terrain than the skimmer, and so could'nt be seen by any pop up - after all they are not just close to the terrain, they are in it.
In retrospect, the rule needs to draw a line thats non scientific and works to ease game play.
It just bugs me that they can be 3/4 into the terrain and be seen by the skimmer, but if they had been just ourtside the terrain they would be safe.
Anyway, i thought I would share my terrain fury and invite other points of hatred at terrain rules (no practical reason, I'm not looking for a rule change, just to explain the annoying bits to newer player, - and mainly vent

)