Necromancer: Speed of Shadows removes only one stack of movement-impairing conditions

Movement-imparing conditions stack in duration.

I notice pretty much every day, that entering shroud often does not cmpletely remove a movement-impairing condition but only shortens its duration. This issue happens frequently in WvW when multiple targets apply cripple, chill or immobilization. So I guess the trait removes only one stack but not all of them.

So a crappy trait that turns out to be even crappier than most people expect.