This is my perception, when I lived in Philly a few years back my neighbor 2 doors down was old and deaf. When he came home with groceries my sons knew as I was taught, to run out and help him carry them in. There were never words exchanged because he could not hear. Communication between him and us was simply a wave a smile and hand motions of I got this I’m here to help.
I can fully understand a deaf person not hearing a siren behind them and continuing to drive not paying attention to what is behind them.
It’s a shame when he did learn that a cop was behind him to stop, put it in park and put your hands at 10 and 2 on the wheel.
Jumping out was not a good reaction