the only evidence we have how they fought on that feild is how it was in-game. and in-game both of them were using stealth and CQC when they found eachother out (i mean comeon, she was dressed perfectly for the occassion and was running around and hiding as well. in fact SNAKE was the one looking for Boss. not the other way around. she kept using camouflage and the trees for hiding and sneaking up to Snake the whole time)
and Snake was the one who walked away from it. it was the first time when Snake actually wasn't conflicted over the fight and did what he realized he had to do. Focused Snake pwned her.
Big Boss (as name implies)>>Boss
for one you don't have proof?
and secondly, BOSS was the one who used stealth as was obvious throughout the game. throughout that whole fight she's using camouflage and trying to sneak up to you for CQC and then start shooting at you with that b!tch-of-a-gun.
and seriously, you know how far you are from the truth considering that Darkstorm and I are actually agreeing on something for the first time since 2006 😆