It doesn't matter. EN had a gun. He chased them with the gun. He killed Tammy and then he attempted to murder Brandon.
And he never mentioned anyone shooting at him to the three people he told about this.
Unless some material fact changes he is toast.
Have I misunderstood? Did Brandon not have a gun? Did he not try to shoot and kill a person who was driving on a public thoroughfare?
What if Brandon had somehow managed to hit one of the occupants of the car? Lucky for him, I guess, that he is apparently a very lousy shot. Not so lucky for his mother if he indeed was attempting to "protect her" by discharging his firearm, but very fortunate in many ways for the occupants of the "silver car." He must not have even hit the car, or I feel certain the driver/owner would have been identified by now.
JMO