RepulseController

[languid mortar]

You could check the distance to the player to see if he is in range

[marsh totem]

I'm beginner I don't know how to do that

Maybe raycast ?

[languid mortar]

you can check the distance between two points with the
https://docs.unity3d.com/ScriptReference/Vector3.Distance.html

[marsh totem]

My test can be on the nade ?

I want to limit the playercontroller

[languid mortar]

sure you can have the code in the nade

[marsh totem]

I'll try