On the first cinematic , we see Ashe use her ''ultimate '' and the effect when the arrow land , freeze the target during the ''stun duration''. I feel like it should been added to her new VFX
Fast foward at 2:00 . Warwick end frozen just like Sejuani perma frost. Personally , it would fit the theme of Ashe and add more clarity of who get stunned when a fight occur and everyone is gathered at the same spot.
Thanks in advance for your answers,
Quinn Is Bae