It happens to everyone at sometime. The neighbor could just as well have been bowhunting or driving his car down the road and run into the thing. It's natures wild critter and we have no possession tag for them until we shoot them. Don't condemn your neighbor because he likes to hunt or hunts with something different than you. At least he didn't sneak into your place and shoot it at night. I remember watching 4 bucks one summer, an12, 10,8 and a nice 6. I had them figured out... no question. I arrived opening morning to find the 12 had been run over by a car the night before. His carcass was beside the road with his horns cut off by a local cop. The 10 I killed on opening morning. The 8 we found shot with a gun weeks before gun season opened. The 6 jumpedd off a bank into the path of a car and greviously injured a local school teacher who ended up with brain damage and will never teach again. Stuff happens. Your neighbor sounds like had a fair chase hunt and was successful. Congradulate him. If you shot it before gun season he could be complaining about the bow hunters having the advantage of the first season.