Context: His heart grew weary at the thought . It was a new reaction to a painful memory . Vader wondered if this was how Obi - Wan had felt when they fought on Mustafar . Anakin promptly buried the thought as he took control of the battle ; he did n't really want to know .
Question: Who might Obi - Wan be to him ?
Option 0: Foe
Option 1: None of the above choices .
Option 2: Subordinate
Option 3: Stranger
Answer: 0