Photoshop :: Selection / Patch - Select Blue With Quick Selection Tool?

If you look closely in the attached picture, there is a spot of light blue on the player's helmet, that looks like a mistake (think it should look like the grass behind it)...though it actually may be part of his helmet.
 
Regardless, I'd like to take it out. My idea was to select the blue with the quick selection tool, then bring that selection out to the grass, select the grass with that size/shape of selection, copy/paste and then bring the grass selection into the blue part so it looks like grass in what was the blue part.
 
The problem is I don't seem to be able to move the selection without taking the blue with it (so it's not an empty selection and therefore can't select a piece of the grass.)