Suge Knight, more than likely, tried to put the squeeze on Juvenile when he showed some resistance or wasn't with whatever Suge was proposing...so Juvenile, knowing Suge's rep, got spooked and took the first thing smokin out of Cali, lol. Obviously I'm just assuming but why else would he just leave his people like that? That's that fear.
And when someone responds to something that angrily and furious, it's usually because it stirs up old memories/feelings that don't sit well with you...like running away and leaving your people behind, for example.