Well, OBVIOUSLY, one of the girls is secretly able to fly. Let's call her... X.
The other girl, H, secretly hates X and wants to kill her. And they're playing Minecraft in H's room. H decided to kill X by pushing her off the room and having her land in this hole she dug and covered up with magical leaves that look very surreal.
H pretends to see something out the window and persuades X to climb onto the roof by climbing out the window to see what she's seeing.
X does so because she thinks that H is her best friend.
Decide what happens next :D
... Wait is there a rule against this being violent