We don ' t need it . Because the Janna player knows where it is going and usually sets it up in advance and casts it when the enemy will walk into it . Or the Janna player will cast it immediately when the enemy is close by and it doesn ' t need to charge . There is not really a point for allies to know where it is going , because the Janna player is the one controlling it . You can see it goes south and try to get the enemies to go south , but if the Janna player doesn ' t cast it again in time , then it would feel shit for you because you tried to set something up and it failed . This ability is just for the Janna player to master and to know where to aim and when to cast . <| sep |> Was a hyperbole , but props to you and your research