Ch'i

I hate guns...

Well, being a martial arts instructor, I can tell you that Jiu Jistu isn't very effective in street fights unless you are extreemly good at it, and even then it's too risky.
In a street fight, like your's, you want to do three things.

1) Run. Not engaging in a battle you don't know you can win is NOT cowardice, it's wise.

2) Disable/distract them quickly. There are many spots on the body that are very vulnerable; throat, groin, eyes, ears are a few of the important ones. A strike to any of those places will normally throw off their balance, cause alot of pain, and give you an opening to escape.

3) If they have a knife/gun give in to their demands.

Sounds like they really caught you off guard though.

At my dojo they teach alot of defense classes that include disarming an attacker (knive, gun, ext.). I would suggest taking something like that. Most schools should have seminars, or open classes like that for people who want to know how to defend themselves in those sort of situations.

That really does suck though. I hope you recover well & fast.

P.S: Tell me where it happened and what they look like, I'll show them what happens to someone who jumps a fellow TFP'er...