How to delete pictures from one album on the iPhone but still keep it in the other?

I had a lot of photos in one album so I decided to move it in another. Now I want to delete the pictures I moved from the original album but everything I try it only says delete from everywhere. I tried clicking on the arrow from the bottom of the picture to see if I could delete it from there but that also doesn't work either.

If you try to delete it from an album you have created, it will work, if you try to delete it from Camera Roll, it will delete it from everywhere. Camera Roll is kind of like the Source of you pictures. Albums are just for organising.