To defend yourself in court, you must prove you reasonably believed that they could kill you or do you serious physical harm. aka
Ability means that the other person has the power to kill or to cripple you.
Opportunity means that the circumstances are such that the other person would be able to use his ability against you.
Jeopardy means that the other person's actions or words provide you with a reasonably-perceived belief that he intends to kill you or cripple you.
Ability= Two on one=present
Opportunity= They are presumably near you.=Present
Jeapardy= They stated their intent to take your wallet.=Present
Give an extra warning if you have time, if they don't back off immediately, engage them.
Actually if you end up in court you have to convince a jury that a reasonable person would believe that they would be in danger of death or great bodily harm. It doesn't matter what a person thinks when it comes to proving they are justified, what matters are the facts leading up to a person pulling the trigger.
A more clear version of the system you posted is weapon, intent, delivery system.
Weapon, what do they have that can cause you harm?
Intent, are they handling a firearm at a gun store (no intent to harm you) or do they have a knife and they are saying they will cut you?
Delivery system: Do they actually have a way of delivering the force? A person with a knife that says they are going to cut you, thats standing 300 meters away doesn't have a delivery system. A person with a pistol at 50 yards away does.
When you enter this situation into the weapon, intent, delivery system model, this is what you get:
Weapon: Fists
Intent: Their statements show intent
Delivery system: They are close enough with fists that they could cause you harm.
The question comes could they reasonably cause you death or great bodily harm with just their fists? If your a crippled person, you have more weight then if your in good shape and have some fighting training.
There are disparity of force possibilities here. First its 2 vs 1, which puts the 2 at an advantage. Second the age of the two people vs you could be a factor as young kids can run further and faster. Third possibility to escape might be a problem depending on the location and whats around you. Given the situation in many states you would not be able to pull the trigger unless you have disparity of force in your favor. Given just the details there really isn't enough to warrant deadly force in most states. There could be 100 situations that are just like the one posted, and each one might be completely different depending on minute variables when it comes to using deadly force. If one person had his hand behind his back or in his pocket, that can change things vs seeing empty fists. If you can't outrun them, nobody is around to help, and their comments suggest that your likely to be beat up even if you give them a wallet, things would be different. The problem with these scenarios is they are not realistic in the fact that there are little to no details. The details on how the 2 criminals were acting as far as body language goes is absent mostly. Much like people say 90% of communication is how you say something and not the words chosen.
A couple very serious things everyone on here needs to understand:
You can't use deadly force on someone who does nothing other then disobey orders. If you draw a gun and tell someone to stay back, yet they continue to advance, the fact they aren't listening doesn't give you justification to use deadly force. Other factors such as them having a knife, having a crowbar, and other factors are what are important. Them coming closer could provide them a delivery system for the weapon they have, which could change things (aka the fact they are closing distance and thus could actually put you at a reasonable risk of death or great bodily harm is legit, the fact they aren't listening isn't) Absent of other factors, failure to obey orders is NOT a valid justification to shoot on its own, and it does NOT fulfill any requirements states have for actions that can be defended against with deadly force
Also, yes most states laws require someone to be at a reasonable risk of death or bodily harm before a person can use deadly force. This means that when your dealing with unarmed people it becomes a very slippery slope. Thats were disparity of force factors are very important, because they are about the only things that will save you. If the perp's capability of generating force that could reasonably cause death or great bodily harm is non existent, you have a problem using deadly force. In most states deadly force is legally allowed to be used to combat potentially deadly force/great bodily harm threats only. If you aren't at risk of death or great bodily harm (Great bodily harm varies from state to state, however its a lot more then just a broken nose) then you better not shoot or you will likely be found guilty.