I was intrigued, so I looked it up: 12 feet wide and 26 feet long not counting the gun, so two wouldn’t fit in the square. Which is a shame, because I am now picturing neither party able to bring a gun to bear and just slamming their barrels into one another’s turrets.
Ooohh! The fish slapping dance.
It’s animals but not live so just weapons!?
If not. Golf balls at twenty paces. I have never missed even a small tree trunk at that distance. 
When these threads come up, I tend to brag about my martial arts training – who’s to know better anyway 
But, given the conditions, I’ll throw a twist in the pattern: Teeth/Biting.
I’m going to assume the challenger will therefore choose first blood – because most people of my size/strength/endurance/mentality would simply be grossed-out by the thought of trying to chew on a person until he/she is incapacitated (or dead!) :eek: and a lot of people would be pretty grossed out just by the thought of trying to bite someone else to intentionally draw blood.
–G!
And I would bring my song.
If you think “killing me softly with his song” is merely metaphorical, you haven’t heard me sing. Even my wife and son tell me to STFU.
Dicks.
Our duel will be a dickfight. An awesome dickfight.
The other guy had better be careful not to step on his dick.
There appears to be nothing in the rules that requires both parties use the SAME weapon. So I choose a hand grenade for me, and a throw pillow for my opponent.
Slings, à la David and Goliath.
Living in this hypothetical universe I would be aware of the possibility of being challenged to a duel and would have become proficient in an unconventional weapon.
(TLDR, so shrug) Duelling pistols. I can hit the broadside of a barn with a handgun and a lotta guys can’t.
Either unarmed combat or single sticks.
Wouldn’t a hand grenade be barred as an explosive? (That is not stopping me from imagining you being suffocated with the throw pillow while you fumble with the pin on the grenade. :))
If I’m the challenged party I get to choose the weapons, right? He gets a water balloon filled with pure dihydrogen monoxide. I get a full auto Thompson with the vertical foregrip and loaded with a 100 round drum magazine. And 2 spare drums.
Fine, then I’ll go with **Ranger Jeff’**s fully automatic machine gun and extra ammo:p.
Food fight.
Even in loss, everyone wins.
a .45 automatic. One round in a clip, clip not loaded. Safety’s on. I give it a 80/20 he wont figure how to load, chamber, take safety off and fire before i will.
Or a sword and shield, unless a shield counts are armor.
You both get the same weapons.
It’s a 20 foot square. A fencing piste is only 6 feet wide (though it’s more like 40 feet long). I’ll take a rapier.
I would choose mu-fois.