Not the best back stop on that 150 meter target shot
I would have to agree with that.
How do you know there is no-one there at the church? How do you know there is no one in the bushes? Someone could have wandered up to look at the old abandoned church. Someone could be out for a walk. Even if you own all of the land, you still can't know if someone is trespassing. Children especially will trespass and lurk in old buildings or bushes. Adults are not beyond exploring land that doesn't belong to them.
You should always shoot with a clear backstop. Best way to mount your balloons is n