Can I get in trouble for this?

Yesterday I delivered some taco bell at around 9pm, not too late but definitely dark out. It was a hand to customer order so I pull up to the pin and some guy comes up to my passenger side window. I ask for his name and hes the quy so I reach across the seat to hand him his order. As I'm puting my seatbelt back on he comes back up to my driver's side window and says I forgot his drink and like mistakes happen ik I said sorry and he starts going off about how I need to hand him cash to cover the cost of the drink and I said to contact Uber support and they'll reimburse so I close the window and bro hops in front of my car not letting me leave, I can't reverse either. Then the customer pulls out a knife and starts scratching the front of my car, so I point my Glock 19 out the windscreen and he screams bloody murder and says he's going to call the police and on me and report me to Uber. I felt extremely unsafe and he seemed like a threat to my life since he had a deady weapon. I do not have a concealed carry licence. Can I get in trouble with Uber if he doesn't have any proof? This happened in Northgate Seattle area.