He also learns that it is important to cultivate a peaceful environment rather than reacting to adversity with hostility. Sodapop's outburst serves as a catharsis for Ponyboy. He seems to snap out of his depression and is able to think of Dally and Johnnie without overwhelming sadness.
Partnership by estoppel means that a person who is not technically a partner can be held liable as a general partner would be for any debts and damages owed to a third party.