Well I think the real question is what are your ethics if you encounter another human being when you have retreated into the woods? … Do you avoid them?

Yes. “Get off my lawn” would be the appropriate response.

Do you try to dominate or exploit them? If so that is libertarianism.

No, that is not Libertarianism. Libertarians want very small government, focusing on protection of one’s rights and one’s property.

lib·er·tar·i·an·ism

/ˌlibərˈterēəˌniz(ə)m/

noun: libertarianism

• a political philosophy that advocates only minimal state intervention in the free market and the private lives of citizens.

Do you work toward partnership and mutual aid? If so that’s anarchism.

No, that is not anarchism. Anarchists want no government whatsoever.

an·ar·chism

/ˈanərˌkizəm/

noun

noun: anarchism

• a political theory advocating the abolition of hierarchical government and the organization of society on a voluntary, cooperative basis without recourse to force or compulsion.

No offense, but honestly? I find anarchism to be even more ridiculous than libertarianism, and us libertarians are absolutely ridiculous. Sure, “voluntarism” sounds good on paper but what ends up happening looks more like Somalia in practice.