I can’t link to the image but I found a bug that let’s him get outside the map, I think it happens at random at the bruiser camps at the bottom of the screen.
I do have a screenshot of it if Blizzard needs to see it.
EDIT: just to give more information, the ult needs to be used at a certain spot for example; at blackhearts bay at the bruiser camp on the bottom of the map, it will clip outside the map and let you walk on the water.