Good, so everything turned out okay this time. Let me offer everyone a little "real world" advise:

1) Drawing the sgian dubh and sticking it into the table is legally defined as "brandishing" and is prohibited in around 99% of all municipalities in the USA.
2) Whether "brandishing a lethal weapon in public" is a misdemeanor or felony will depend on the jurisdiction in which you reside.
3) Multiple thugs should never be aggressively confronted, except as a last resort.
4) If you are of limited physical ability and find yourself regularly in situations where self-defensive measures may be necessary, consider the following:
(a) avoid going to those places, if at all possible. OR
(b) obtain a permit to lawfully carry a concealed firearm or other, non-lethal, deterrent (ie: pepper spray, tazer, etc.).

If anyone really thinks that they can run off a bunch of punks with 3.5 inches of pointed steel, then let me suggest one other thing you might want to have tucked into your sock. A large can of Vasoline. It'll make having something shoved "up there" a lot less painful when you are overwhelmed by a bunch of thugs who are street tough and not afraid of a few cuts or scratches.

One of the best self-preservation tools is your cell phone. If you see a potentially dangerous situation pull out your phone and dial 911. Don't push the call button, but pretend to be talking to someone. Acknowledge the potential threat with eye contact, and maybe a slight nod of the head-- this tells them you know they are there and are aware of their movements. KEEP WALKING. If the situation escalates into a potential confrontation, PUSH THE BUTTON and call 911. KEEP WALKING as you speak to the dispatcher. Tell her that this is a PHYSICAL ASSAULT IN PROGRESS and KEEP WALKING. DO NOT SPEAK TO YOUR ASSAILANT. Speaking to an assailant will only escalate the situation. If the assailant asks for your wallet (or whatever) give it to him-- remember: compliance is better than a conflict you may not win.