Odds Against Us: Flood

Please note that the main character's name is John, with no relationship to Master Chief.
==Prologue==
Call me John. No, not Master Chief. I'm not the same guy who saved Earth by giving the Covenant back their bomb and killed The Ur-Didact. I'm a Spartan IV. And this is my story.
==Chapter 1: 1 to 10==
I patrolling when I first spotted it. It was a lumbering beast, like a bear, but it it stood upright, and a parasitic virus over it. Flood. "Bullcrap." I muttered. I got low, pulled out my assault rifle and zoomed in. I pulled the trigger, 3 bullets and the thing fell, heart shot. I hoped it was dead, but you never know with the these God-forsaken parasites. I drew my pistol and slowly and carefully walked up. It was dead, but to be sure, I shot it twice. It moved. "What the-" The thing lunged upward and slashed with his talons at me, raking my shield. I jumped backwards, drawing my energy sword and stabbing it in the gut. It fell forwards as I sidestepped and stabbed it from the side. It died with a groan. "Echo, check for breaches in armor." I said to my AI. "Scanning.... No breaches detected. Flood are approaching from the west." My heart pounded. "How many?" "Ten. A Gravemind is in the 100 mile radius." At this last thought, I tuned in to the command frequency. "Command, this is John-258. Reporting from patrol. Flood are in the area. Gravemind on the planet. Tell base to get ready." "Rodger, John-258. Over and out." I rushed back to cover, waiting for the Flood.
==Chapter 2: Shoot, Slice, Go.==
I waited for not 3 minutes. I saw the first 4 ahead of the others, presumably to scout for enemies. I had dragged the dead Flood into a bush, afterward decontaminating myself with my equipment. I was waiting for all 10 to come. I had a grenade in hand, hoping to kill all of them. I saw the other 6 come in, group up with the others, now moving in a pack. Towards my direction. I got up, pulled the pin, and threw it like a baseball. It landed on the ground beside them, exploding and probably killing half of them. I swore. I was aiming in the middle of them. I pulled my assault rifle out and fired into the pack. I saw 4 on the ground. The others moved up toward my position, spread out so I couldn't fire into them and shoot them all at once. I shot one, and it went down, but then I was out of ammo. I dropped my rifle and pulled my pistol, shooting rapidly at them. Another went down, and then I drew my energy sword. I slashed at one and it stopped, cut in half. I felt myself get tackled from the side, my sword went flying, and I landed hard on my back. The last Flood was next to me, growling. I pulled out my pistol again and pulled the trigger 8 times. Immediately I was disappointed with my shooting. It was a large spread, and only one hit home in the head. The others clipped it. It reeled back, growling in pain. I rushed to my sword, the Flood behind me. I grabbed it, turned, and saw the Flood was in the air. I slashed. I saw the thing come apart like a grenade exploding. I gathered my supplies and headed toward base.