Re-watching viewing Chang as God's vessel....That makes the tension and confrontation between Chang and Julian way more powerful. Chang empathizes with the fukked up situation Julian was born into, and how he still has loyalty to his demented mother.
The mom definitely sexually abused her oldest son, she literally had a moment of silence in thinking about the size of his dikk
That fight between Julian and Chang represents when a lost soul that is literally mad at the world. Chang recognizes that Julian isn't frightened at all, many depressed people aren't scared they just don't know what to do or where they are going.
And when you are mad at God and the world you will get your ass BEAT

The look on the other officer's face when he asked Julian "Do you know WHO he is?"...and Julian nodded barely showing fear.