If u put a fence up with pistons and someone stands on top of the fence he bugs inside of the fans

 

What I expected to happen was...:
Fix the issue

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. put fences on pistons
2. let a friend stand on the fences
3. put the fences up with the pistons

4. your friend bugs inside the fences