Cowboy Bebop references
Enter the apartment building at the back alley, then go to the upper floor. Go to the right until reaching the end of the corridor to find Ed and Ein.
Make your way to the apartments. Before advancing, return to the start of the game to interact with Spike Spiegal.
After curing Paul Erickson, return to the burned down hideout where you obtained the Carbon Ray Stabilizer to meet Faye Valentine.