My mouth was gagged and I couldn’t scream my pain to the dark emptiness of the cold room. My hands were tied to the pipe behind me so I couldn’t reach out and break his neck in two, or skin him and let him slowly bleed to death while I break every bone in his body.I noticed a few inconsistencies in your verb tenses throughout this piece. I out in bold an example of past and italics one of present.
I felt my skin splitting open like a piece of fabric being torn.I like the vividness of this.
I stared up at his face, while he stood on his knees and knelt down to do a better jobThis didn't make sense to me. SHe looked up whil ehe knelt down?
‘Look down!’ He said and slapped me with the heel of the blade hilt, hauling a moan of pain from my throat and a gasp for breath when the hit was insistently followed by an unpredicted slash of my skin.he should be lower case and I really don't know what you mean by 'hauling'. . .
Chuckling happily, I watched him running a finger along the most recent wound, covering his skin with my blood.First of all, it isn't clear who's chuckling here. Second, cut the 'happily' out. We get what you mean.