Twisted & Evil Vader: How did Obi know?
In ANH, when Obi explains to Luke that Vader killed his father, etc., now "...he's more machine than man..."
If Obi left Vader for dead, burned and dying on Mustafar, then went into hiding on Tatooine, how did he know that black suit cyborg Vader exists?
let the fires commence if this has been a repeated question