The word perfectly describes your mindless thought. What are you going to say next, "don't use the word âblueâ to describe the color blue because it isn't your (my) word, and it's old."
Well, I could start in on "allusion" with that one, but honestly I sense I might be using the privilege of my education to nitpick.
"Enemy camp" is a methophor used in a lot of situations, and the subject has a military context. So when using it to describe an actual military camp, it becomes a literal comparison! Perhaps a simple slip of the tongue, or maybe it reveals something deeper about Matthews. Can't say for sure. These talking heads blather for hours, a slip is inevitable. Maybe he has used the phrase a thousand times, ...