Derek walked down and saw someone who he thought was his girlfriend Zara but it was actually Melanie.
Derek confirms that she looks like Zara but Melanie points out that Zara wears green and she wears purple.
(Derek walks over to someone who thinks is Zara)
Derek: Zara, why are you different?
Melanie: I am not different and my name is not Zara! I'm Melanie! Why did you mistake me for Zara?
Derek: I thought you were Zara because you look just like her, as you have the same hair.
Melanie: Thanks for telling the truth, but Zara is the one wearing green. I'm wearing purple. You are ungrounded for pointing out the mistake.