What's wrong with this picture?

It just dawned on me that there is something missing from this picture. Can you guess what it is?

How are the horses going to get around this obstacle? Not only that, given that this was installed within the last month it tells me that there haven't been any horses using the trail, as well. It appears there is another task for August 23rd: Cutting a path for the horses to get around this obstacle.

Also, think there is the potential for another stunt here. On the right, that rock could either be dropped or rolled. Have to take a closer look at it next weekend.