In Black Lagoon, Hänsel and Gretel are deranged children suffering from Dissociative Identity Disorder.
Each of them have distinct personalities, but from time to time, they switch places with each other - clothing, weapons, voice, personality, and everything.
In episode 15, both of them are killed. Hänsel (the boy) dies in front of Balalaika after being shot by a sniper. Gretel (the girl) dies at the end of the episode when a hitman headshots her from behind.
But do we know if they were themselves when they were killed? Did Hänsel really die first?
Or were they switched? Are there any clues anywhere?