Thread:PrimusMobileVzla/@comment-11200708-20180815060728/@comment-7709681-20180815063206

Is true that the ball's hitbox is what is considered, but being able to drift on curves isn't different from Sion during his ult.

At worst is a bug, at best is an unintended feature, either way is an unintended effect that wasn't meant from the designer, so goes into the Ability's Description until a Rioter gives a proper explanation and if they say it remains as a feature, then it stays.

Also, for clarity purposes, commonly on the Wikia is in the description where forms of mobility are specified whether can go through terrain or not.