That unnamed guard may have feared the unnamed pedophile would have circled around and came back at him to make sure he was dead. Lucky the 16 year old girl, with him in the car, was not killed too.
Sorry, shooting into a car you know contains people other than the person you’re trying to shoot is only rarely justified. Never, if the car is driving away.
I’m not in favor of adult males going after 16 year old girls, and I have no problem with it being illegal, but those who do are hardly pedophiles, which refers to attraction to pre-pubescent children.