If he calls the cops, you could just find yourself looking down the wrong end of some heckler & koch guns from the armed response unit of your area. I don't think that the farmer would walk up to a bloke with a gun in his hands....... you know its an air gun , he does not from a distance and shure as heck does not want to find out what it is by getting closer. So I would think he would call the folks in those colourful cars.
ATB
Michael
he might be lucky and hear the chopper approaching Scuba