Sion ult + walls and turrets

I've noticed that sometimes you can bounce off walls and turret ruins at unexpect angles, has anyone else been trying to practice bouncing off walls or ruins, I think it has something to do with the angle you hit it at, I bounce more often when running along walls and slightly arc in to it.

I have noticed that you can turn more when running right next to a wall, not sure if related or imagination.

Any thoughts or insights?