When Charon and Dante are merged, using the active item and either shooting or moving lets you swap where Charon is facing. This setting changes which two, between shooting (or Firing) and moving, actually swap the direction Charon is facing.

Having it set to "Fire" will make Charon switch to the direction that you click your Fire key in (Up, Down, Left, Right)
Having it set to "Move" will make Charon switch to the direction you click your Move key in (WASD, or if you're using a controller, Joystick Up, Down, Left, Right)

引用自 Grynn：

When Charon and Dante are merged, using the active item and either shooting or moving lets you swap where Charon is facing. This setting changes which two, between shooting (or Firing) and moving, actually swap the direction Charon is facing.

Having it set to "Fire" will make Charon switch to the direction that you click your Fire key in (Up, Down, Left, Right)
Having it set to "Move" will make Charon switch to the direction you click your Move key in (WASD, or if you're using a controller, Joystick Up, Down, Left, Right)

I understand now, thank you for explanation, at first I was confused and thought that it teleports the player but not that I understand this character I LOVE IT, very original.
Very liking this mod and cant wait for more :)
Cheers and good luck.