Voldemort took out his wand and cast the Bubble-Head Charm on himself. It was a charm that produced a bubble around the head of the caster, giving them a continuous supply of oxygen and allowing them to breathe where they could not otherwise.
It was the most effective spell for breathing underwater or in any environment where fresh air was scarce, allowing one a supply of oxygen. Then Voldemort made a flick-and-switch movement using his wand to cast another spell.
The blood in front of Harry started lifting off the floor. At first, Harry thought he had gone mad, and his mind was playing an imaginary scene, but the blood continued to rise.
Harry remained still and only moved his eyeball upward to see where the blood was going.
Dobby's mangled corpse lifted into the air, the blood-soaked limbs dangling bizarrely. The organs, once scattered across the floor, now floated alongside the lifeless form. Harry watched as all the blood on the floor began joining the corpse in midair. The blood swirled around the body, gathered in a sphere. When the final drop of blood joined together, everything stopped. Then Harry saw Voldemort taking a step toward the blood sphere. At the same time, the corpse in midair moved. With every step taken by the dark Lord, Dobby, his organs and blood moved accordingly until finally, Voldemort was in front of Harry.
"Harry," the cold voice of Voldemort called for the boy. "What would the world do if they knew you were responsible for another death?"
From the newspaper he had previously read, Harry knew what all of them would think. They were already calling him the boy who killed. Maybe even his friend would call him a murderer. He could already guess how the ministry would put a bounty on his head for whoever could capture him. He did not expect any help from either Dumbledore or his friends.
Voldemort lifted the boy's head with his left hand and said, "Everyone would go against you. No one will try to help or even be on your side. But worry not, Harry. I'm going to help you. I will hide this sin of yours forever, never letting anyone know of this death you have caused."
The words of Voldemort felt like a shock. Harry could not understand. Voldemort was going to help him. His eyes fixed on Voldemort as if Harry had heard the impossible.
"I know you don't believe me. But I know better than anyone else how it feels to be alone against everyone. This is why I'm helping you, my boy. Look!" With that said, Voldemort pointed his wand toward the blood sphere.
EVANESCO.
Harry recognized the spell immediately. It was the Vanishing spell. It was a Transfiguration spell used to vanish both animate and inanimate objects. Even though Harry has not yet learned about it, he did hear and see the Professor at Hogwarts use them.
In front of Harry, the body of Dobby, the hanging organs nearby, and the blood gathered in a sphere began to change state. They looked translucent and slowly lost color. All the remaining of Dobby disappeared.
"See, Harry. There is no proof of your sin. I have helped you, and no one will ever know you killed that house-elf." The voice of Voldemort felt surreal. Harry continued to fix on the spot where Dobby was previously.
"It's truly gone. No one will ever know. They won't know that I killed Dobby. Voldemort is true to his word. He has helped me." Harry muttered, unable to think properly.
Voldemort watched with satisfaction and decided to further help the boy, "Look at the poor state you are in, Harry. I'm sure you have begged everyone to help you. No Dumbleodore, not even your supposed friends have come. Let me help you."
AQUA ERUCTO.
Just after Voldemort pronounced the incantation, a spout of water surged from the tip of the wand. Harry could not react, and the water hit him directly. The tip of the wand continued to produce water until finally Harry was covered entirely.
After what seemed like a full minute of being splashed against water, the spell stopped. Harry found himself leaning back against the wall. His clothes were completely drenched. But Harry also noticed that the vomit or any blood spots were no longer on his clothes.
All around the water was on the floor making a mess everywhere.
Then Harry saw Voldemort cast a wordless spell. The spell that Voldemort did was the Drought spell. It was normally used to dry up small bodies of water, such as puddles and ponds, but it was normally difficult for such a huge amount.
But that limitation was for a normal wizard. Not someone as powerful as Voldemort. In no time, Harry found that all the water disappeared, but when he looked at himself, he saw his clothes were still wet. Without any need for thought, Harry knew that Voldemort was going to help him solve that.
And indeed the dark Lord did.
He saw Voldemort pointing his wand at him, and then Harry felt a hot air hit him. The Hot Air spell allowed Voldemort to stream hot air out of his wand. The hot air, in turn, quickly started to dry off Harry's soaked garments.
Harry felt a brief moment of change. Everything felt refreshed, but then he remembered again who had just helped him. It was Voldemort. "Funny," Harry thought. How the person whom he did not beg for help, did not ask for any support, was the one erasing every trace of his mistake.
Maybe that was the way Voldemort was going to give him false hope before finally killing him. Harry's eyes lost the momentary spark he had just gotten.
But then Voldemort did something unexpected. He saw Voldemort reach inside his dark robe and take out a wand. Voldemort then placed it just in front of Harry.
But the surprise was not done.
Harry saw Voldemort throw his own wand away and stand still.