Rooke had no idea whether the natives had a word for treachery. His conversations with Tagaran had never traveled in that direction.
Even in English, treachery was a word with a broader reach than it was entitled to. What it boiled down to was that the men in this hut had been taught to fight by certain rules. Not fighting in accordance with those rules was treachery. (in reference to the aboriginals as they fought the English- English method vs. American or connection to - American vs. terrorist).