I would say the options are 4.
1. Move to another area. (What is going to happen once you both appear in the same area to actually hunt? I don't envision happiness that day)
2. Speak to the guy and work this out. Tell him of the legalities of his activities. let him know you don't want to possibly take any heat for it should LE come around.
3. Inform LE and request that they handle it.
4. Stop hunting.
DON'T BE SILLY! SCRATCH #4!!!!!!!!!!!