Why does C# object initializer has this behaviour?

Why does C# object initializer has this behavior?

public class ChuckNorris
{
    public string Impact { get; set; }
}

public class Burnination
{
    public string Impact { get; set; }

    public ChuckNorris GetChuck()
    {
        var chuckNorris = new ChuckNorris
        {
            Impact = Impact // <- Why does the right hand "Impact" property here automatically refers to "Burnination.Impact" and not "chuckNorris.Impact"
        };

        return chuckNorris;
    }
}

Like the comment in the code above says. Why is that the right hand Impact property is pointing to Burnination.Impact and not the Impact property of the ChuckNorris class. How is this assumption being made that I (the developer) am referring to the Impact property of the underlying class?