The Battle
Harry walked outside the next morning, intent on spending a moment away from the inhabitants of Hogwarts. He walked to the lake edge and sat down on a boulder, staring aimlessly, until he looked up. What he saw made his heart stop.
"Attack!" he screamed, and then vanished into the Great Hall. He burst through the doors, "Voldemort is attacking Hogwarts!" Harry ran back outside to face Voldemort.
The Dementors were coming first, gliding across the lake. The rest of the school, minus the first and second years, assembled behind him. Harry began to feel cold until Fawkes began to sing, driving all fear away. Everyone cast the spell at the same time, "Expecto Patronus!"
The Dementors were ground to a halt before they even got to solid ground, and then they were chased away by an enormous amount of Patronuses. Everyone cheered, until they saw the Death Eaters, dozens of them, marching straight for them.
Harry immediately left his army to find Voldemort, and, hopefully, finish him off.
"Hello, Harry."
Harry spun around to see his archenemy, "Hello, Tom."
"How does it feel to find yourself at the end of your life?"
"How does it feel to watch your army beat back by children?" Harry gestured around him.
Without warning, Voldemort attacked, "Advada Kedarva!"
The spell hit Harry in the chest and then it circled around him, leaving no mark, "Is that the best you can do? Expellarmious!"
"Adava Kedarva!"
The two spell met in the air and the reverse spell effect occurred once again.
Except this time, Voldemort was sent away from the castle, along with his entire army.
Harry collapsed on the ground, unconscious.
Harry woke up and opened his eyes, but it was as if he hadn't. Everything was black.
"Harry?" asked Ginny's voice.
"Gin? Where are you?"
"I'm right here, Harry, look at me."
"I can't Gin, I'm blind," Harry said weakly.