They're Random, Baby!

Screen Captures from the O'Donnell/Staten interview

Snapped September 14/16, 2001 by halo.bungie.org
This is Mendoza - he's a marine. He's just tossed a grenade in through that closing door in front of him... the grunts are about to meet the door while airborne. The blood spatter on the floor is one of Mendoza's buddies that didn't make it.