Edward studies his homunculus alternate. "I see," he says in a dangerously quiet tone that anyone who knew his father would know exactly where he got it from. He learned it at Hohenheim's feet, at his elder brother's feet, at Al's feet. It is a tone all Elric men know well, that too soft, too quiet, too dangerous tone.
If he had the ability to freeze a room with that tone, the office would be arctic.