Lanterns Episode 2 ending reveals John Stewart’s mysterious power; what does Sinestro know about him?

In the second episode of HBO's Lanterns, viewers are introduced to the ominous Manhunters from the Corps' past. John Stewart surprises everyone by crafting a living bird using his low-charged ring, piquing Hal Jordan's interest. Antaan, hunting for a Manhunter, soon enters the scene. Meanwhile, Sinestro shows keen curiosity about John's extraordinary talents, wrapping up the episode with two intriguing mysteries surrounding the Manhunter and Sinestro's insights.