If someone demands my wallet in Illinois, and I draw, but do not fire, is that brandishing?
Some criminals in Chicago are pretty smart about how they rob people. The various charges escalate from robbery to aggravated robbery to armed robbery.
Here are the statutes concerning robbery
So if a thug comes up to you with a weapon that is clearly visible and verbally threatens to use the weapon if you don't turn over your wallet, he has committed armed robbery and is looking at an additional 15 years being added to a sentence, (although in practice the robber probably only gets an extra year).
If a thug simply approaches you and says "give me your wallet" - no mention of a weapon, no weapon visible and no threat, then the robber, (if caught) will probably receive a lesser charge of just robbery.
Illinois is not Florida, if someone comes up to you and "demands" your wallet, your justification in drawing your firearm is evaluated in light of 720 ILCS 5/7 1) (from Ch. 38, par. 7 1), Sec. 7 1. Use of force in defense of person.
The law says a person is justified in using force when
1) he reasonably believes that such force is necessary to prevent imminent death or great bodily harm to himself or another, or
2) prevent the commission of a forcible felony.
An argument can be made that when someone comes up to you and demands your wallet that there is an implied threat of force if you do not comply, but a stronger argument is that you were being robbed. Robbery is a felony, therefore the use of your firearm (even if you did not fire it) is justified under the statute since it was necessary to prevent the commission of a forcible felony.