'Lanterns' Episode 7 Ending Explained: Antaan, Sinestro, and Who Killed Hal Jordan?

What happened

Hal’s mysterious vault sends John Stewart through a portal and deepens the mystery surrounding his death.

Summary assembled by rule from the sources below

Timeline

1. 02:00
   First appeared on PolygonPPolygon
2. 02:10
   Screen Rant started reportingSScreen Rant

Sources