mills went on looking : `` well , all right , '' he might have said , but did n't : `` you 're firing on beings you do n't even know to be hostile or friendly '' : that word came to mills 's thought : hostile , it was a great wordthe way he said itbecause it came right up that way , but what he really meant to formulate in words was how happy did n't even know if he were firing at an enemy or not , so mills came out with that : `` you do n't even know if you 're firing at the enemy ! ''