Right, and isn't that essentially what weapons like shock mauls do? Not that that's the only way to have your charachter get shocked, but it's probably the most common. I guess if you showed me nude pics of someone like Rosanne Barr or Susan Boyle first thing in the morning I'd be pretty shocked as well, but probably not drop my toothbrush, and be reasonably able to hold onto it if someone grasped for it.
This is how I understand it. Feel free to critique these as you see fit, but they work pretty well for myself and my group.
I'm going to use the Shira Calpurnia book descriptions as my basis. When the shock maul is making contact it does cause involuntary muscle seizure and constriction. It's also painful. While the shock is being delivered the person is helpless, but as soon as the shock ceases the subject regains some control. They're still in pain and don't have full mobility/dexterity for a while. So, in game mechanics I suppose this translates into fatigued. While the shock is being delivered you ARE helpless (useful for narratives outside of true combat) If you hold a fully powered shock maul to someone's sternum and continuously discharge it the target is helpless the entire time. Once the shock ceases their muscles have a chance to recover, but the strain will have left them fatigued. Do this enough, and they'll pass out. Fatigue causes a -10 to tests, right? -10
Personal experience and what I understand from the game mechanics are this. You take a nasty hit and for a few seconds can't do much of anything. Like when you get the wind knocked out of you, or take a nasty hit to the head that doesn't knock you out. You're not going to be able to do much while you collect yourself. You're probably not that aware of your surroundings, and can't focus well enough to process the stimuli. (or you just don't care) I've had the wind knocked out of me plenty of times to know that it takes a few seconds before I can do anything. I've held onto things while this has happened, but it's been pretty easy for someone to take an item from me. For instance a baseball bat after a pitcher tried to soften my skull. A nasty hit to the head left me dizzy and fuzzy for a bit. This is stunned. I would make this a -20 penalty (or +20 bonus to the player)
You just don't see it coming, so you don't have time to react (unless you have wicked good reflexes/overwhelming strength) Hence the -30 penalty (or +30 to the player)
You're unconscious. You have been knocked the **** out. Your fatigue has exceeded your TB. A jarring strike to the head, being overcome by pain, or suffering from shock to the point where you pass out. Maybe you took a nasty 10 meter fall, suffered impact damage, and accrued enough fatigue. If you've "blacked out" you are helpless, and you are not stunned. (Guaranteed)