Let me get this right so I understand at how stupid these people are.
They know he has shot someone so they chase a person who has shot someone who still has a gun !!! Anyway 3 felons off the street for the time being, well done kid.
Doesn't sound like they know, at all. They merely heard something and are alleging it.
Not nearly enough to violently attack someone.
Especially someone who says they are going to the police.