While fighting Lyssa Drak, Sinestro tears a page from the Book of the Black, something given to her by Krona. A chronicle of all things that are and will be, something that the Black Guardian Scar had used in the months leading up to Blackest Night. Ripping this page out gives Sinestro some…unpleasant visions of things to come.
Like the Guardians Third Army, the deaths of Corps members including Hal at the hands of Black Hand. Sinestro himself enslaved by the Indigo Tribe, and a Guardian holding up a White Ring.
Something is rotten on Oa.
