Hal Jordan And Sinestro VS Black Lantern Abin Sur
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