It was mentioned the bull was agitated. Depending on how "agitated" it was that shot placement to the brain might not be so easy, especially at night and if it was a dark bull. A 9mm to the face/nose/jaw/neck is going to make for an unhappy bull.
i killed a 900# Santa Gertrudis steer i hit with my car, shot it in the eye (at night)with a 22 rifle then called the sheriff and told him i wanted the steer.
God bless Texas----------------------- Old 300 I will remain what i am until the day I die- A HUNTER......Sitting Bull Its not how you pick the booger.. but where you put it !! Roger V Hunter