Unless the man was restrained or blocked from reaching the Mayor before he could draw again....or unless the mayor put his gun in his pocket to pick up his shotgun, he was taking a major risk for no reason.
But in fairness to the mayor, many mayors were listed on the roll of MAIG without their knowledge or consent. Unless this guy has spoken in favor of MAIG's goals/policies/practices, he should get the benefit of the doubt on that one.