Earth Bind

Binding Ritual. Create a level 1...8 Spirit. All foes knocked down within its range are knocked down for at least 3 seconds. Whenever this happens, this Spirit loses 50...30 Health. This Spirit dies after 15...39 seconds.

Can somone explain this skill to me. The spell description seems pretty self explanatory but it doesn't do what it says. What exactly is the range of this spirit? I've been trying to use it in conjunction with bramble and wanderlust. I've run into PvE situations and cast earth bind while monsters have been attacking me and once it's cast they still don't get knocked down. How often do they get knocked down? I've also been messing around in random arenas. How do I get this spirit to knock things down??? I've just never seen this spirit work...

it doesnt knock down foe's on its own it yust makes it so that any foe who gets knocked down stays down for 3 seconds now wanderlust knocks down (moving?)
foe's and thus none moving foes wont be knocked down

Wanderlust, an elite, knocks down anyone who is not moving when they get hit by its attack. Earthbind sets a KD minimum time to 3 seconds on foes.