When translated into English, the Grubbles music is basically all about telling the highbloods to fuck off and that if they mess with the lowbloods anymore, they'll be in for a world of hurt.
About now, I bet you're askin "Who are these punks?" Or maybe you think we should fetch you a drink! Well in low-blood fashion, You can suck my chitin chunk!
ACT 1: Kansas City Shuffle
Jude's paranoia turns out to be well-founded, and his preparations in saving Joey from the monsters ultimately pays off. Even Joey, who is initially skeptical of the plan, admits that she's impressed.
ACT 2: Dead Freight
So far, Xefros has been established to have weak psychic powers. But when he and Joey have to fight Azdaja, he displays a stronger power than usual when the goldblood knocks down Joey, enough for Azdaja to consider him a Worthy Opponent.
DON'T HURT MY FRIEND!
Xefros is terrified of clowns to the extent that his fear makes him unplayable while in the clown car. But when Baizli tries to pre-emptively kill Joey, Xefros hurls him over the side of the car, impaling and killing him.
For Joey, breaking through to Xefros and getting him to see what a shitty moirail Dammek has been to him.