User blog comment:Lesdin/Adara, the Calamity Adherent/@comment-26203093-20161014012954/@comment-3391671-20161015054852

For Shiva's Link, the angle circles around Adara (supposedly making a complete orbit after 3 or 4 seconds) with a 60o cone. Whenever Adara casts an ability, it will cause her to appoint that angle towards the direction of cast. This will remain for up to ten seconds in a similar fashion to 's, granting immunity in that direction. Once the ten seconds are up, the Link will become unappointed, returning to its orbit around Adara.

Once again, when you cast an ability, that is when it will "stop moving" as it becomes appointed in the direction of cast. Q and E are the main abilities that will cause the appointment, while having their own effects (the shards that Q sends out will not affect Shiva's Link unless all three are sent out; Shiva's Link in theory contains three shards). Out of all the questions you have brought up, "it's a directional shield pivoted at her centre, and the abilities decide its direction" may fit it best.

If you still have questions, please ask.

I too agree though that the W's stun may need a little nerf, but I will looking into the kit more soon and place my review below instead.