What is the music that plays when they are securing a perimeter around the building and Clay Othic finds the hand on the ground and puts it in his pocket? Then I think it also plays when Tim "Griz" Martin gets blown in half and says
"Tell my girls... I'll be... okay," then McKnight holds his hand for a while. I think it also plays in that part too. The song is pretty much just heavy, dark drumming. It is a very dark song. I don't think it has any chants or voices. I love the music in this part. Please tell me what this could possibly be. I don't think it is on the soundtrack, but it is a good piece of background music. . Much thanks to whoever finds the piece of music!

It is an original score composition, and it wasn't released anywhere yet.