Just a oneshot, my take on what would've really happened to someones mind in this scenario.
DISCLAIMER: I DO NOT OWN DEAD SPACE OR DEAD SPACE 2, NO MONEY IS BEING MADE FROM THIS PIECE OF FICTION.
Isaac wasn't sure when it happened. At what point did he start to stop caring about human faces on the nightmares he butchered? When did he stop feeling horror at each new monstrosity the Ishimura threw at him? Why doesn't he pity the children turned Necromorphs when he dismembers them with plasma anymore?
And when the fuck did he begin to enjoy it?
'This wasn't him. He isn't some callous bastard who just sees targets.' Try as Isaac might, he couldn't quite convince himself. He'd stopped seeing the people who the Necros used to be, and now just see's obstacles in their place. That revelation should horrify him - and in the beginning, it did – but now he just feels empty where the horror used to be.
It's long since been replaced with glee.
Before this whole mess, Isaac wouldn't have been able to recognize himself now. Sunken and gaunt face, bloodshot eyes due to lack of rest with the slight glint of madness in them. Limbs twitching in response to all the tiny noises around him, reflexively aiming wherever the loudest noise came from. Blood soaked engineer suit, none of it his, and not all of it Necromorphs either.
Mercer squealed like a pig when he gutted the bastard.
With a dark chuckle Isaac carefully aimed his plasma cutter at the joints of the Slasher coming towards him, aiming for the limbs. Not enough to kill the thing, but enough to cripple it enough that it couldn't run. This game of his got a lot less fun when the Necromorphs started to recognize him. When they started to fear him. When they started to run.
Perfect. Slasher limbless, still 'alive' and nothing to try and rescue it. Fun.
Dismantling a Ripper Ammo case, Isaac grinned under his helmet. He hadn't worked on a Slasher in a while.
Starting to whistle some tune he'd had stuck in his head for Altman knows how long, he started dragging the Slasher back through the Medical Deck, until he reached the gurneys.
Twinkle Twinkle, little star,
How I wonder what you are.
Finished strapping the thing down, he got to work with the ripper blade, starting his new 'information extraction' process. Somewhere in his mind he recognised the fact the Necromorphs couldn't speak anymore, but he as now beyond caring.
Up above the world so high,
Like a diamond in the sky.
Such a lovey melody, mused Isaac. Shame the Slashers screams interrupted it. When the thing fell silent, Isaac moved on, 'No point in trying to bring back the dead after all', he snickered to himself.
Making his way through the ship he continued whistling, all thoughts of Nicole, Kendra or Kyne long gone, replaced by the need for more 'information'.
In the end, the only thing left on that ship was Isaac. And when he was picked up and moved to the Sprawl along with the Red Marker, he never once stopped whistling through long parched and cracked lips.
And when the Necromorphs came to the Sprawl, and Isaac was released, he was still whistling. And overjoyed by the sheer amount of 'information' to be found. And in the end, Isaac was all that was left on the sprawl as well.
There was a monster on the Ishimura alright. Shame they brought it back to civilisation.
