I wish I could give you a citation, because I can’t recall where they did this - it isn’t in the charging affidavit. It may have just been Corey’s statement in the press conference. That’s why I said they “implied” it, but I remember commenting at the time that this would have to be the only way they could try to allege that Zimmerman had started the confrontation in a way that might forfeit his right to self-defense.
Pot is known to make some people paranoid, and for that reason Mr. Z may not have been “wise” to approached the stoned Mr. M. But Mr. Z sure as heck did not violate any law if he did, short of (again as you suggest) purposely brandishing his pistol at Mr. M. Just letting the pistol be seen isn’t a threat, or every cop walking down the street would be a threat.