That's not how it's done. If he was a smooth operator, he would've left with a smile, and two weeks later had them attacked. I would actually find that much more intimidating and effective.
He was probably high on cocaine and drunk. Apparently his crew is one of the strongest and he is pretty wealthy. Too bad he is a loose cannon.
High on cocaine? The Sicilian faction is notoriously against drug use. Lanni however is a drinker. Let's not accuse someone of drug use like that without zero fucking evidence
