This script works fine, except when the cursor is occupied by another application or similar.
Basically, when I have a game like Minecraft open, Minecraft is using the cursor. When I run this script from a hotkey, scrot(?) cannot get a hold of the cursor so it fails. The cursor has to be free, as if I were to pause the game.

Opening a terminal first makes minecraft loose focus and I get my cursor, which works, but I'd rather have it bind to a key.

Is there a way for the script to make what is having the mouse occupied to free the cursor? Or is there some other way I can fix this?