They don’t do Hurdles on Hills.
Probably because it would be insanely difficult.
No one would ever think to try it.
You would probably get hurt more often than not.
But if you did do it, you would probably develop muscles you never knew you had to propel yourself further up the hill, against gravity past the hill. You would probably need to be more aware of your surroundings when pushing up and you would most likely need to pull in your legs much closer when you leap.
It would be that much more difficult to accomplish, but when you go back to doing normal hurdles, the lessons you learned would be easily applied to something that much easier.
Somewhere out there, there is a person doing Hurdles on Hurdles up a Hill.