He simply stood there as the bolt of plasma raced towards him.
"Chief?!? Chief!!! Dodge it!!!"
He watched it fly at him slowly as if the world had slowed down just for him.
"Oh my god I'm gonna die!!!"
He was tired, too tired. He wanted to fall on the pavement and rest, but he couldn't.
"This is the end..."
The plasma smashed into him, burning through the armor and drilling into his chest.
He fell, slowly still, and watched as the alien walked up to his body. It balled up it's fist and punched in his skull...
Then he woke up in cold sweat, and looked around to see only other marines, sleeping peacefully in their bunks. No aliens, no Cortana, no armor.
No death.