Warmaster Horus
Explorer
I really don't understand how hide works...
You can only hide if you have no line of sight.
How is your rogue benefiting from his Stupid Stealth if he is out in front and can be seen? What is the point of his stealth roll?
There's a difference between having line of sight and having cover to hide behind. When I mention direct line of sight it assumes no intervening piece of cover. This does not mean that the hider need be completely obscured and can indeed observe those it is hiding from while still maintaining the ability to hide. So moving while maintaining cover (pretty easy for a Wood Elf in natural terrain) is what's meant here when moving in forward-scout mode.