Green Lantern Hal Jordan, Sinestro, Star Sapphire Carol Ferris, and Indigo One, take on Black Lanterns Abin Sur and his sister, Arin Sur.
Sinestro had a relationship with Arin Sur and it must have gutted him to see her again and then kill her, even if she was a space zombie.
From – Green Lantern Vol. 4 #47
