|Chadwick Bosman as Jacob King|
He pokes around and quickly discovers that his sister was involved with some very nasty characters. He shortly convinces them that he is not to be trifled with. That's a motorcycle chain he's carrying in the picture, his weapon of choice.
Turns out he is from Cape Flats, a nasty, brutish suburb of Cape Town, home to the infamous Numbers Gangs. Well, semi-infamous anyway. I never heard of them, but Wikipedia has an article. It is a very curious, and unpleasant, story.