He then took of his jacket and thossed it to the floor.
That scenario to me spells imminent attack.
Anyone who has spent more than three minutes in a NYC subway will tell you that this is simply a NYer having a very bad day.
(If everyone were to take this as evidence of an "imminent attack", there would be several people a week getting perforated in a NYC subway.)
In February 2023, there were 169 major crimes on the NYC subways.
Somehow I have a hard time correlating that with what you said.