Among the Hill Martians a challenge by combat is somewhat different: once a challenge has been made, none may speak.
The conditions: no interference, to unconsciousness, each champion has a second, none may go tend to the unconscious until the second declares the champion the loser, both must remain within the 30’ circle around the fire, going outside of it means you get held down and the foe gets a free blow. Only the allies of the one who falls may tend to that one’s wounds.
Among the High Martians: they drew a circle, about 10’ diameter around the two duelists. It’s the starting point. No interference is permitted.