Hal was devastated when the Guardians took his ring away. But he was determined. He has to protect you. He’d do anything. So that’s why he put on a yellow ring and joined the Sinestro Corp.

He floats in front of you. “I did what I had to do,” he says. “Plus, I look good in yellow, don’t you think? And-“ you feel a sharp jolt in your head - “I know all of your fears. So now I can protect you better. Isn’t this great?”

This isn’t the Hal Jordan you knew anymore.