Roger hit the floor hard. The jolting impact with the carpeted wood probably shook a few rooms nearby his own but he was pretty sure everyone was out today anyway. He spins around on his back only to get pinned by his doppleganger holding a knife in his left hand. The Evil Roger plunges it horribly close to his neck only for Roger to catch it in time. The tip of the blade was uncomfortably close to his adams apple.
Evil Roger smiles menacingly and begins speaking in a gravely tone much different from normal Roger. "Once I dispose of you, i will have no issue integrating myself into your life and hiding among-st your friends. And then, I'll kill them too and replace them. And again, and agaiiin."
Normal Roger increases his grip on Evil Rogers wrist and begins twisting the knife while trying to work his left hand free. Sweat ran down both their faces as it became a battle of strength.
Rogers left hand slips free of his grip and locks around the hand with the knife. He pushes into a twist forcing the knife out of Evil Roger's hand and effectively spraining it.
Evil Roger howls in pain and rolls off of Roger allowing him to scramble for the knife. They both stand up and face eachother, Evil Roger being positioned in front of the inter-dimensional rift he came out of.
Evil Roger: "This isn't over."
Roger laughs
"Yes it is."
Evil Roger attempts to throw himself back into the rift but Roger was faster and grabs him by the shirt collar, plunging the knife deep into Evil Roger's throat.
Evil Roger try's to scream but blood filled his throat and mouth. The last thing he felt was Roger jamming a grenade into his front pocket and a heavy boot kicking him backwards into the hellish portal from whence he came.
The Rift worked quickly, consuming Evil Roger and pulling him back to wherever he came from. A faint "garrarrgglglgble" could be heard as he disappeared into the unstable nothingness of the hole ripped in space and time, punctuating with a mostly muted "boom." The explosion must have completely destabilized the connection of the rift to the world as it collapsed in on itself with a sharp hissing noise and a puff of air throwing paperwork on Roger's desk everywhere.
Roger slumps down to the floor and holds his head in his hands. His entire body was shaking and his clothing soaked with sweat, nearly dying really takes it out of a person.
"That was close. They don't play me enough for this stuff." he muttered to himself. But he was relieved that there would be no more chance of invasion by an army of dopplegangers anytime soon now.
Roger hears a sharp knock on his dorm room door from where he was sitting. He gets up and walks to it, turning the doorknob and cracking the door cautiously.