This is probably not a bug, but I find that it is very hard to understand when mindherd will give controll and when it is not. When is there an enemy figure between it and neares psion? Some times Im very suprised when I dont get controll. And how do I know what fields will be controlled? Not very important, but if someone could explain this I would be greatefull:)

It gives control of each hex that is closer to both psions than distance between them.

ok thanks!

and opponent mustn't stand in ANY of those hexes?
or just on the closest path? again - if there are several, at least one to break the ability for that turn?

Any enemy figure in those spaces that might be controlled disables whole effect.