Мафия 52. Max Payne

Pardon me, I wasn't paying close enough attention. I suspect that the clue:

Like brothers on opposite sides of the barricade

likely refers to Sub-Zero. The point is that two people, who were siblings, bore that nickname. And now, as far as I know, the "older Sub-Zero" has become Noob Saibot and is no longer on the side of his younger brother.