Cooper gets a letter from windom earle given to him by gordon cole gordon yells out. It looks like a chess deal! Cooper sais windom earle's name and than he sais it again louder so gordon can hear him.
And than he sais bless your heart coop it looks like were going to have to watch your back closely from now on or something like that.
I think this occurs somewhere from episode 10 to 15 but i can't remember the exact episode.