The Causality Theorem

"Go on, Jynx is probably doing something crazy.”
Tye stood up and followed Mal into the wagon. Jynx was rummaging through a chest at the foot of her bed. Her legs swung in the air, as her upper half disappeared into the chest and reappeared again with a random object in her hand. She would study it, find it lacking in whatever purpose she had planned for it, if indeed there was a plan, then tossed back into the chest, diving for another object. Eventually she pulled out a small snowglobe. She shook it.
“Woah…” she said in an elongated sigh then giggled. She practically jumped out of the chest and skipped past them without recognizing their existence. Tyler caught a glimpse of the globe. Inside the glass was a park bench and a few street lamps. On the bench sat a couple, a man and a woman, engaging in a kiss. Tyler and Mal followed her out of the wagon and further down the paved road. Jynx abruptly stopped and waited staring up into the air as if expecting something to be there that wasn't. She looked up at Mal and back to the air, then back again. She gave a slight growl, then cleared her throat.
“Ahem.” Mal looked up at the sound.
“Oh, sorry little one. Where to?”
“Anywhere!” she screamed happily, throwing her arms into the air. The sleeves of her jacket danced in a soft breeze and Mal raised her hand. A blue wooden door was created in a torrent of sand.
“How’s Chicago sound?”
“Perfect.” Jynx replied in a cheerful way. Then ran through the door. Mal and Tyler followed. Mal laughed as Jynx ran, dragging the sleeves behind her. The stopped almost immediately at the sheer drop in temperature. Tyler looked up and saw the sky scrapers of what he assumed to be Chicago. It was December and snow had fallen on the city.
“Is this the real chicago?”
“Yes,” mal replied. “But its a few weeks before you met Morrigan.”
“You can go back in time?”
“Not really, Were here but not physically. If you walked up to someone and tried to talk to them chances are they wouldn't even see you.”
Jynx tripped and fell into a pile of Virgin snow. She giggled, sat up and looked around. She eyed a park bench, looked at the snow globe, and quickly rushed over.
On the bench, a young woman sat in the sunlight reading a book. She wore the same clothes at the woman in the globe, a red pea-coat and jeans with a white beret. Jynx tiptoed up and gently placed the globe on the opposite side of the bench then ran away giggling with manic laughter.
Jynx ran to a tree behind the bench and climbed up into it, hiding within the branches. Moments later, a young man approached the bench looking concerned. He wore the same clothes as the man in the globe. A black jacket with sweat pants. He began to search the area of the bench frantically. The woman looked up and spoke. Tyler was shocked to realize he heard every word.
“Can I help you?” She asked politely, “did you lose something?”
“My book, I think I left it here.” The woman looked embarrassed as she closed her book and showed it to him.
“Is this it, I was laying here, I found it and started reading it.”
“Oh my god, yes, that's it.” The woman looked slightly disappointed and attempted to hand it back. The man noticed and shook his head.
“How long have you been reading it?”
“About two hours. It got me hooked.” The man slowly sat beside her.
“You want to borrow it? We have class together, you can give it back when your done.”
“We have class together?”
“English comp one.”
“Oh, right.” They exchanged a laugh. Jynx appeared to be impatient. She jumped out of the tree and rushed to the bench, grabbed the globe, and placed it in the space between them hard, causing a thud on the wood. They both looked down at the globe. Mal laughed and Tyler smiled.
Jynx ran back to them and stared at the couple, giddy with anticipation. It took a while, but eventually it did happen. The couple exchanged a kiss.
“Yes!” Jynx cried jumping into the air. “It is done.” She rushed through the door behind Mal and Tyler. Mal gave him a look and followed her.
“How?” Tyler said closing the door behind him. Mal shrugged shaking her head.
“She does that.” Jynx looked up at them and noticed Tyler’s confusion.
“His name is Robert E Knight. In 8 years he creates a weapon that would kill millions. Now, they will marry after she gets knocked up. They will die in a car crash in 6 years. He will never even start his research.” Mal smiled, patted her on the head, and walked toward the caravan. Tyler stared in disgust.