The international posters and US IMAX poster have various variations of the phrase 'The Final Chapter' as the tagline. However Antoine Fuqua in an interview while promoting the film has said a prequel and a sequel could happen if Denzel was still interested.
In the vineyard barrel room in Sicily with all guns trained on him, Robert warns the crime boss that he has 9 seconds to decide his fate. Although it seems far shorter, he actually lets 10 seconds pass before he springs into action.
This movie marks the fifth collaboration between Denzel Washington and director Antoine Fuqua after Training Day (2001), Equalizer (2014), Les Sept Mercenaires (2016) and Equalizer 2 (2018).
In every Equalizer movie, the final climactic face off scene has always been set in a highly precipitous environment. The first part had the fire sprinklers raining down. The second part had a hurricane. The third one had a rain storm.