Could charge you with job abandonment and insubordination.
This situation with
@Madgreek happened exactly the same to me before. I was punched out, chased down by a ORS, and told to punch back in and work as directed or be written up for job abandonment. Situation was slightly different in that we were backed up due to weather (snow).
My Steward, who is really good, always has the same advice: Unless illegal or unsafe, you are in a stronger position when you work first and file after. I went back out, worked at a safe pace, and filed a harassment grievance against the Sup.
I would advise you to do the same and quit buddyhing to your fellow Union members about this situation. During peak, same thing, I drive 30 mins back to the building when the green light goes off near the hub. I stop the car, it states to go help someone, I turn around and drive 30 mins back out.
This is the easiest job in the world unless you let THEM get to you mentally. Your in Napa, lol, go back out and enjoy the scenery that people pay $1000's everyday to go see and get PAID.