4. They really care for each and other. The moment Bryon knew that Mark was hurt everything he was doing, thinking went dark and he rushed right to Mark feet pushing aside everybody that was on his way. He wanted to kill the guy that K.O. Mark really badly. He even went to the hospital to see him after, he forgot of his date thinking nothing but Mark's safety he almost cried. We can understand that Bryon protects Mark like a brother they really watch each others back.
When Mark come back with a shirt his size and say's he found it on the floor, Bryon knows he's lying but does not question him of his method he knows he probably rob it somewhere. They give themselves some liberty and privacy.
When the guy's are back home they speak freely of how the felt of the night, that Mark felt better when Bryon was beside him when he was on the ground. He tell's him that he feels that he his his actual brother. That represent how close they are.

5. (p.68) « Do you ever get the feeling that the whole thing is changing? Like somethin' is coming to a end because somethin' else is beginning?» He refers that the reality is changing, before they were all in gang they would do some gang fight they would die for the gang and everybody just slip away like nothing happened.
(p.69) «that was then, this is now.» Bryon says that. It's really the title and also the reality has change you can't do nothing about it you need to accept it. The past is the past «that was then» you can not go back you can only push forward. Things change you can do nothing about it «this is now» so accept it.