To some extent, younger guy is a participant in the conversation, but mostly as a supporting player. Then, without any warning or acknowledgment YG gets up and walks to the front of the bus, pretending to exit in the middle of OG's sentence. OG continues talking until he notices YG's attempted escape. Realizing his abandonment, OG chases YG to the front of the bus.
YG's ruse is up, apparently discussion continued.