Joe answered all the questions but one which was about two colliding objects of different masses. Joe mentally pictured two iron balls of various sizes and was about to have them collided when his thoughts were interrupted by a muffled noise coming from behind. As he turned around, he saw one of his classmates, Daniel Norton, rise from his seat and start towards the exit of the classroom.

A bit taken aback by his actions, Joe looked into his face and froze. Daniel's face was absolutely emotionless and his glazed eyes were looking straight in front of him as he slowly walked down the passage between students' desks.

What seemed even stranger was the fact that no one, except Joe, seemed to be interested in why a student had suddenly decided to leave the classroom in the middle of the lesson without informing the teacher of his intention.

Joe was about to ask Daniel, but their teacher was quicker. "Farewell, Mr. Norton," Mr. Mason said in a monotone voice, never looking up from the book he was reading. Joe's mouth dropped open. Never would Mr. Mason let a student go without knowing the reason!

Feeling that something very odd was going on, Joe silently followed Daniel with his eyes. But just then his classmate suddenly stopped behind the teacher and spun on his heels, his face straight, his eyes on one point somewhere in the class.

Joe didn't have time to try and see what or who he was gazing at when his oddly acting classmate started to raise his hand. For a brief second it seemed to Joe that Daniel's hand had been pressed against some kind of a glass wall as his palm turned slightly whiter, but before Joe could understand if it was so or no, Daniel's hand turned a healthy shade of pink again and moved further.

As if fascinated, Joe watched his movements with great interest. Daniel was still staring at something and then made a gesture as if he was inviting someone to follow him. Daniel beckoned someone of the class, probably, that someone he kept gazing at, to him.

Joe turned his head to see who it was, but suddenly saw the stout figure of his physics teacher, which was blocking the view.

"Mr. Hardy, why are you looking aside? Have you finished?" he sternly asked.

He was there! Rushed through Joe's mind as he looked at the empty teacher's desk. And where is Daniel? Baffled, he turned around and to his astonishment saw his classmate, sitting behind him and looking quizzically at him.

"Mr. Hardy, are you all right?" the teacher repeated.

Totally confused, Joe nodded his head. "I'm sorry," he muttered and lowered his head over his papers, feeling like an idiot for taking his reverie for reality.

He composed himself and pushed his mind off everything else but the papers in front of him. He completed the task by answering that the smaller object will be pushed away for 3 feet after being hit by the bigger object just before the bell rang, announcing the end of the lesson.

Joe gave his paper to the teacher and hurriedly left the classroom. It was lunchtime and he couldn't wait to join his friends at lunch which they had decided to have outside. It was mid-September and the weather disposed the teens to enjoy one of the last warm and sunny days.

Cheerfully greeted by everyone, Joe completely forgot about his strange dream and was having fun with his brother and their friends on the lawn near the school's parking lot when the calming sounds of the autumn day were shattered by the piercing sound of squeaking tyres. The next moment they all heard a muffled sound which was followed by screams from the people in the parking lot who started running towards one car which had abruptly stopped for an unknown reason.

"What on earth happened?" Frank frowned and arose from his place to see. His eyes went wide, "Oh man, someone was run over!" with that, he darted off to the car, everyone else on his heels.

Joe's legs gave way under him and his heart stopped beating in his chest as he recognized the hit student. It was Daniel Norton, he lay on the ground, 3 feet away from the car, his glazed and unblinking eyes wide open and his hand was curved in the gesture Joe had seen in his reverie.