Staying some distance behind the fence, then. He'll be quiet and use natural cover. Maybe climb some trees if any are available and would give him a better view.

Does Stagskull Man appear to be the leader of the group from what he can see? Giving orders to others, them showing reverence, etc? If Levi stays there for a day or two, would he see him (or any of the others) leave the encampment? Any pattern to it?

Is there any children or sick people that he can see, or infer the existence of from something (like toys or small laundry hanging outside)?