More or less. For people like him, his status as a warrior is a massive part of himself. There's a code of honor to be followed on the battlefield generally in places where he and I come. Whether you and your opponent acknowledge and abide by it, though... the majority don't.

You won't be able to trust Estinien to keep that code right now either after this, although I don't think he would lie about it and backstab you outright...