You would have to post that "legal definition" for your comment to have any creditability; because I know of no law that says anyone has to wait UNTIL a weapon is pointed at them, but you could show me where I'm wrong.
Using your example: a person that hands a bank teller a note saying he has a gun and wants all the money, can't be charged with using a weapon when he's captured; because he never exhibited the weapon and never pointed it at the teller.
Decided to add the following:
Criminal Threats
1 - A criminal threat, sometimes known as the terrorist threat, malicious harassment, or by other terms, occurs when someone
threatens to kill or physically harm someone else.
(drawing a gun can be considered a threat)
2 - The threat must be communicated in some way,
though it doesn't necessarily have to be verbal. A person can make a threat through email, text message, or even through non-verbal body language
such as gestures or movements.
(drawing a gun is non verbal and is a movement)
3 - The threat must be capable of making the people who hear it
feel as if they might be hurt, and conclude that the threat is credible, real, and imminent
(drawing a gun on a Police Officer, is usually considered a threat)