Under the circumstances, I would have been scared to death to be confronted out in the middle of nowhere in that way. I'm not as big as you, but even so, I am also not a ninja. I can't fight four people at once, even if they weren't armed. I would have been scared for my life. It gives me chest pains to think about it. When you add knives to the mix, that would have tripped my switch.
Best advice is to keep the rest of this to yourself and to consult with an attorney before talking to ANYONE else about it