Separate image even though there's no space between them

[KayleMaster]

As you can see, the bow is separated from the image, requiring manual work, which without zoom (the top left doesn't help when you can't move your mouse 1 px to the left ! ) is tedious.
I checked the image and those parts of the bow aren't separated, they're just diagonally adjacent to the pixel that's in the image. Setting the distance to +1 doesn't work in this scenario since it becomes just one image the whole thing.