The bald man wiped the trekking sweat from his head, pressing a button on his watch; which was concealed by his heavy jacket. It was a dark evening in the small town of Gravity Falls. Rain was pouring hard, and it was staining the trees, which were catching the drops as they fell.
Blendin Blandin, of the year 207012, was invisible to the naked eye. The button he had pressed caused him to blend into the background, which was the Mystery Shack's outer walls.
The rain splattered against his jacket, but Blendin was too aggravated to notice. Mabel and Dipper had committed too many time disturbances; if they lived in his time period the two would be long since dead.
His reason to travel back was to punish them. He had to; time is a fragile being, and two 12-year-old kids aren't going to get away with shattering it.
By the time an hour passed, Blendin realized Stan Pines walking past him. His glasses hung loosely from his face, and his grey hair poked out from under his red fez. At first Blendin wanted to run away, but then he remembered that Stan couldn't see him. He was still growing accustomed to his blend-in jumpsuit.
What if Blendin followed him to get into the Shack? It was the best way to go, but he always carried his wall climbing gear as a backup plan.
That's exactly what he did. And 10 minutes later, Blendin found himself in front of the attic door. He took a deep breath a withdrew the small knife he'd stashed in his pocket. The handle had a small hourglass on it, much like the one on his I.D. card.
When Blendin stepped into the door - which had been cracked open enough to squeeze through - he saw what he assumed to be Dipper asleep. Good. He peered around, the darkness clouding his vision.
As the night sky grew darker, Dipper woke up and realized that the felt a presence in the room. As his eyes adjusted to the darkness, he squinted at the lone figure standing next to his bed. "Hello?" he called out. "Grunkle Stan, is that you?"
There was only silence aside from the shallow breathing that wasn't his own and the rain falling outside.
"H-Hello?" Again, silence. "Is anybody—"
"You shut up!" A harsh whisper cut him off and an unfamiliar hand clamped over his mouth. He looked up to none other than Blendin Blandin, the kooky time traveler he had met at the fair. "Blandin! What are you doing here?"
The time traveler rolled his eyes, his face glowing in the dim moonlight. Dipper detected a hint of anger, and immediately frowned, but fear still masked his face. "W-What's happening?" he asked tentatively.
Blendin's expression turned grave. "Your time is...running out."
"But why are you here? You're gonna wake up the whole town!" Dipper said, trying to sound brave. Although inside he was a bit terrified of where he came from. Did Stan let him in? He imagined the scene in his head.
'Oh hey, can I see your niece and nephew? You don't have to follow me.'
'Sure! Go ahead!'
Stan wouldn't have minded at all, the coot. 'Good thing I'm an uncle!' Not if Dipper's safety was on the line.
Blendin's voice snapped him into reality. "I'm here to punish you for your time disruptions. You and your sister almost got me killed!" he snapped, then took out the knife, "Now I need to show you what happened to me."
"W-What's that?" Dipper asked timidly, gesturing with a shaking hand to the knife.
"What does it look like? It's a knife, are you blind?" Blendin snapped, irritated with his ignorance. He smacked the boy hard, drawing blood. The droplets slivered down his cheek in a metallic flourish.
Dipper whimpered softly, trying to stop the blood. "Why are you doing this? I only wanted to win over a gir-"
Blendin slashed Dipper's wrist. The boy howled with pain. Scowling, Blendin shouted, "You shut your time mouth! Do you realize that if word gets out of your wrong doing with that sister of yours, that it could cause chaos? Many would fight for usage of the tape measure! I'd be powerless without it!"
The time traveler slapped Dipper again. He yelped, not caring about being too loud anymore. "We didn't know! We'll never do it again!"
"Shut up! Just shut up!"
"GRUNKLE STAN! HELP ME!"
"I SAID, BE QUIET!" The knife, still dripping with blood, was jabbed towards Dipper's heart. If Dipper's pillow hadn't been there, the boy would be dead. Or bleeding harshly.
By now, Dipper was terrified. What would happen if Blendin...murdered him? Would he get away with it? Would Mabel get framed?
"I'm going to have to end this once and for all." Blendin interjected, a look of grim determination growing on his face.
"W-What does that mean? Are you gonna leave, or...?" Dipper's question came out shaky; his fear not masked successfully.
Blendin frowned, disapproval lacing his stone cold expression. The moonlight cast an eerie shadow on the back wall. Even silhouetted the time traveler looked...haunting. Dipper gazed at the dark patch for a moment. He couldn't look Blendin in the eye. He probably never would again.
That is, if he makes it out alive.
"I have to get rid of you. Forever."
"Wait, what...?"
Blendin dug his sharp fingernails into Dipper's neck until blood caked them. The boy whimpered in pain, his throat aching like hell.

"Dipper? What's going on, you little gremlin?" It was Stan. He had been woken up by faint screams, and since there was no one else in the Shack, they had to be Dipper's.
He rattled the doorknob to the attic. It was locked shut. "Are you alright in there? I heard yelling. Is Wendy with you?" When the door creaked open, he realized that Dipper wasn't alone.
And it wasn't Wendy.
"What the hell? Who are you?" Stan frowned instantly, looking the dark figure of Blendin up and down.
Dipper's eyes widened when he saw the revolver in the time traveler's hand. It glinted in the moonlight.
"GRUNKLE STAN! WATCH OU-"
But his warning was cut off. The gun fired, and Stan's body slumped to the ground in his own blood. Dipper gasped and immediately ran over to his great uncle, even though he wasn't in the best state himself.
"Tell her I love her..!"
Dipper knelt down next to his uncle. "Who, Grunkle Stan? Who?!"
But he was already dead to the world. His eyes glazed over, and all existing power was sucked from his dead body. Dipper clutched his great uncle's hand, hoping he would come back to life and say something like, "Did I getcha, knucklehead?"
Blendin frowned disapprovingly, snapping, "He's not coming back. I killed him."
Deep down, Dipper did know that. But he didn't want to believe it. "Grunkle Stan is going to come back, right?"
"He's not coming back, but you can go visit him."
And Blendin threw the knife and it stuck into the back of Dipper's head. Rose red blood spurted out from the impact, sputtering out of him like a waterfall, making a pool around his growing lifeless body. Blendin watched it oozing from the boy, and he crossed the room and pulled out the knife. After many more stab wounds, he declared both of them to be dead.
The time traveler crouched down and turned Dipper on his back. He picked up the knife from the carpet and brought it to the boy's neck. He jabbed the blade into it and reached in. After a couple minutes of rifling around in the bloody mess he finally located the thing he wanted. Blendin ripped out; Dipper's blood-soaked esophagus. He held it up in the growing moonlight, the blood sparkling in the rays. He draped it around his neck and grinned. It was his trophy. His prize.
Blendin stepped over the bodies in the doorway and into the hall. He cast his gaze around, searching for the girl.
Mabel.