Maybe everyone already knew this, but
You can knock the second part of Ornn ult anywhere in 360 degrees, so you can summon it from the opposite direction of your enemies if you wanna catch them by surprise (obviously forgoing the first damage and slow for the surprise factor)
https://youtu.be/5_f_ZPZsgvc?t=399
Considering how telegraphed it normally is, this is a really good trick to have available.
In theory I probably knew it, but it never occurred to me to use it this way.