Brush? There's no brush at 86th Street. Why do people think the baddies always jump out at them??? It's always a meeting engagement, not an ambush.
I am having a hard time envisioning where on the Monon this would be possible.
There's a stretch between 106th & 111th that is a little bushy, though certainly not secluded. if you weren't paying attention to what is going on around you and the leaves hadn't dropped yet, you would be more likely to be taken by surprise than the stretch between 116th and Bubs.
Also a little bushy just north of Smokey Row where it meets the Hagan Burke Trail.