Trowa shrugs slightly, with the shoulder Quatre's not leaning into.

"They all are, usually. As a baseline."

"I don't know if it's based on some event or tradition, or if it's just part of their nature. But the Milliways population is consistent about that."

It's always a little weird to realize that this isn't obvious to everyone. Everyone observant and intelligent, anyway. If Trowa were talking to someone whose perceptiveness he didn't respect, he wouldn't be surprised at all, but he also wouldn't be explaining like this.