Emitter spawn rotation with a vector direction (Halp, i'm drowning !)

Hello Boys !

I spawn an emitter for blood vfx, what i want is to rotate the emitter in the same direction of the bullet path,

like on this screen, the red line is the path of the bullet.

(if i shoot on the right ears, the emitter should spawn on the left ear, and be in the same direction of the shooter).

I, on early, think it will be easy with taking the shooter rotation, and apply to the emiter,
Not working (or i’m doing bad), the “best result” i can have is this :

But far from the result i want, i’m always a bit lost with rotator, help welcom boys !