He is superior to other rappers and destroyes their lyrics with his own. “Glass jaws” refers to wack rappers. Glass is easy to shatter while a jaw is what let you voice come out.

Glass jaw is a boxe reference: it means you fall down easily when you take a good hit.

A fighter with a “bad chin”, “china chin”, “suspect chin”, or “glass jaw” refers to fighters with limited ability to absorb punishment to the chin or jaw. Many clubfighters and journeymen may have glass chins, although it may depend on weight class or sometimes legs. Some boxing experts, such as Teddy Atlas, believe it to be a mindframe.

Un checkpoint,que l'on pourrait traduire par point de vérification,est un poste de passage,un sorte de péage controlé par des militaires en temps de guerre,qui vérifie l'identité de ceux qui essaye de passer.

Notez aussi la possible référence a un “checkpoint” de jeu vidéo, Qui vous fait réapparaître à un endroit/statut précis après avoir été tué. Il est très possible qu'un enfant soldat de 12 ans croit atteindre un meilleur poste (patron) en défiant la mort, ignorant qu'est bien réelle et qu'il ne possède qu'une vie. Il ne réapparaîtra pas après avoir échoué.

We hear you and are ready to obey, Master!

similar to 300’s ahoo:
http://www.youtube.com/watch?v=29ckPq3PnEc

And the shark, it has tears
And they run down his face

Shark are misunderstood creatures that frigthens most humans. Most humans think of sharks as an evil, emotionless, bloodthirsty animal. Rammstein don’t really have a good reputation either, they are mostly shown as a evil band (Example).

Till point out that sometimes what you see isn’t what it really is. Sharks, just like Rammstein, isn’t evil; what you see is just a facade.

And so many tear flows

Sadness inhabit his heart, he is crying deep inside, but from the outside, you don’t see anything because he’s hiding his emotions like most men do.

“Zähre” is an archaic word for “tear”, even more closely related to the English word than the usual German word, “Träne”.

In the depths it is lonely

Even with fans and family, most of the time, they are touring away from home, alone and on their own, like sharks in the depths of the sea.

And the shark, it has tears
And they run down his face

Shark are misunderstood creatures that frigthens most humans. Most humans think of sharks as an evil, emotionless, bloodthirsty animal. Rammstein don’t really have a good reputation either, they are mostly shown as a evil band (Example).

Till point out that sometimes what you see isn’t what it really is. Sharks, just like Rammstein, isn’t evil; what you see is just a facade.

We will never stop

Sharks have to keep moving to keep water flowing through their gills. If a shark stops, it will drown. Same rule apply to Rammstein, They will never stop making music because it’s part of their DNA.

We keep each other free from injury

“Schadlos halten” is legal terminology that means “to hold harmless”, although, the actual intended meaning is probably “free from injury”

Some types of sharks stick together, like the blacktip reef shark, who work together for food or protect themselves from harm.

This line reinforce the idea that the bond between the band members are strong, which is omnipresent throughout the song.