Morgana and the Crab

Not a long time ago i played a game with morgana, during the game i decided to take downt the crab, i got the Crab with my "Dark Binding" and activated the "Tormented Soil" on him, and i noticed that after the snare duration of "Dark Binding" the crab remains snared and will move only when "Tormented Soil" will disapear, hope you will pay attention to that,Sincerely yours Stav.