Retsu may have forgotten the days when the mongols said hi... Or when the British said hi... Or when the Japanese said hi... Or heck, when the Chinese said hi to each other for countless centuries
Retsu (multiple-time loser of fights and currently dead after losing a fight): "WE NEVER LOST IN 2600 YEARS! (Except the big chinese tournament where half the entrants weren't even chinese, completely clowned on our squad of jobbers, and our oldest and most venerated warrior only survived the final fight by playing dead)."