In a 4.10 project I'm playing with views and partial views but i have a weird issue

I'm trying to get all files from a media folder

Media folder is like this :

Media
--V2
----HeaderImages
------General [id 1]
--------Picture1 
--------Picture2
------Project1 [id 2]
------Project2 [id 3]

When I try to loop the images under general (id:1) with the following code

@inherits Umbraco.Web.Mvc.UmbracoViewPage<IPublishedContent>
@{
 var startMedia = Umbraco.TypedMedia(1); 
}
 @foreach(var mfile in startMedia.Children()){ 
        var mediaName = mfile.GetPropertyValue("umbracoFile");
   <p>@mfile.Id : @mfile.Name : @mediaName</p>
  }

It gives me

1 : General :
2 : Project1 :
3 : Project2 :

With TypedContent Im not getting this behavior, there I get the children not the siblings

And even weirder when I change Children() to Descendants() IIS crashes.

This is on a local dev machine.
This site is running live on4.7 i took a copy to local machine to make some changes and upgrade everything local before doing it on live site.
I upgraded gradually to 4.9 and have been updating everything to Razor macros and everythng works fine.
With 4.10 I decided to play with views and maybe make the switch completely to mvc.

All razor macros still work with 4.10 everything works.

This was the first macro i tried to convert to a partial view (it generates some js to have some slideshow in header) The razor macro works perfect it gets the images with children from the startmedia.

Anyone have a clue what I am doing wrong?

Is there already an documentation to find?