I was able to dive between the barrels and the Mule Kick itself. And the Zombies couldn't get to me. It would been great to add an invisible barrier to prevent this from occuring. And yes, once you dive between the Mule Kick and the barrels you will get stuck.

I have an idea for swamp like maps, even if there's going to be a custom made shi no numa. I was thinking put zombie alligators in those specific maps, like if you can get into the zombie's spawn you would have a chance for an alligator to swoop up and bite your character and bring your character underground and instantly kill them. What is your thoughts about it?