Its a good song. If it is for zombies which it more than likely is, it is a great fit.
However those of you who are saying A7X are Richtofen's point of view, the only parts that I can even consider Richtofen's PoV are the growls.
The rest of it seems like it'd be the other's the ones trying to kill the zombies. Searching Endlessly and fighting til they are free? Pretty sure that's not Richtofen. It could be the PoV of the zombies, they are being controlled by Richtofen to search for the ones trying to kill Richtofen, and they are continually fighting until they die(free).
It could also be the point of whoever we control, Sam and the others or if we get a new set of characters.