Boobie traps are a bit illegal so he could have a suit, something to the effect of it being an emergency yadda yadda yadda...civilly anything goes.
Now you could also have a good case, say you needed to get to the hospital and your vehicle is now assed out with no gas.
Personally, I'd have waited for him and confronted the motherfker. It sucks because you don't need that kind of drama from a neighbor and having to worry about him screwing with your stuff out of retribution.
Round two those it'd be toe to toe, I'd make sure he got enough so there was no question what my fence meant.
Fortunately in my new place I have great neighbors. Some punks came down the street a few weeks ago. It didn't take long for all of us to be out there and send them packing. It's a great difference for many neighborhoods today where people live in attached units and don't even know their neighbor.