Can someone explain the new hills please

[Weasel]

all of the hexes are 10/1/(11) so he did indeed fire, the round followed the flat ground and then sloped downwards following the ridge line as I thought. When I check LOS from my unit I can only see a single hex, the one in front of him, but the enemy three hexes away can see 3 hexes? The old saying "if I can see you then you can see me" should hold true here.

I don't think this feature adds anything to the game but complication.