Sorry this is so short... I wrote it on a whim. If the writing sounds stiff, please inform me. I still enjoy reviews, so please do so when finished reading.
P.S. Don't worry if the sentences are incomplete. The character is about to die! There would be no complete thoughts in that situation.
I stop firing into the massive army as a shadow descends on us. I force myself to look up, and my eyes widen to see a huge winged beast flapping its wings menacingly. I see it lower itself onto the men. The Nazgûl upon its back screeched a blood-curdling shriek, forcing my gloved hands to release the bow I had in hand and fly up to my ears. I rip off my helmet, forsaking the thought of the defense of my head. I scream in unison with the other men, cowering before this great monster. The thought of running enters my head, but I dismiss it, remembering my duty to Gondor, and the post I must stay at. I look around as the beast draws nearer. Grown men are panicking, some are weeping as children do. A few are abandoning their posts, and fleeing wildly into the confusion. I have no more time to observe. The beast dives down as a bird, and expands its wings, hovering over the men. It is as I feared. It extends its talons, revealing a disgusting odor to the terrified men. It is now that I run. I turn around, and push myself as hard as one could go. I feel the adrenaline pump through my body, and I get a sudden burst of speed. I am slowed by the heavy armor that I wear. I stop to rid myself of it, but it is too late. I turn around and see men being scooped up by the Nazgûl. I think even to just jump off the wall, and land somewhere in the burning homes of the bottom level of Minas Tirith, hoping for a chance of survival, however faint and fading that may be. I shake my head despairingly, ready to give up hope. I think to lie on my stomach, and evade the beast. But it's too late now. As I dive down, I feel a great blow to my stomach. I feel the breath get forced out of my lungs, and I feel immense pressure on my abdomen. I feel my ribs breaking, and bones snapping in two all over my upper body. I see men squished up against me, screaming themselves at the creature they fell victim to. I realize the position I am in, and I realize there is no hope for escape. I scream as a babe in arms. We gain altitude, and I can feel my stomach doing flips as we rise. The Nazgûl screeches again, but I do not think to cover my ears. The pain is just too much for me to handle. My arms are flailing, begging with my actions to be released from this monster's clutches. It seems like forever that I am held mercilessly. I am almost dead, but I am still screaming madly. Next thing I know, I am falling. Falling freely from so high. I don't understand. I do a flip in the air, and turn onto my stomach. I see the falling structures of Minas Tirith so far below me, but I realize that I am getting closer to them with increasing speed. I feel a pain in my chest. An immense pressure on my heart. It is unbearable. I want it to end now. I scream again. The buildings are getting closer. Fifty feet. Forty feet…Ten feet. I have given up now. I hear a sickening crack as the men who fell with me land. Soon it will be my turn. I feel nothing now. My body bounces off the roof of the building like a rag doll. No longer do I see the Fell beasts or the Nazgûls upon them. I can't see the White City anymore. Everything goes black.