Harry watched the scene in front of him in shock. Only one thought could penetrate the shock he was in: Dumbledore was going to die. And it was his fault. If only he had taken the potion instead of Dumbledore, then he wouldn't be so weak and this whole situation could have been avoided. Harry knew he had to do something. But what? He was petrified, with no ability to reach his wand. Dumbledore was as good as dead, for all the help he was giving. Harry shook that thought out of his head. This was not the time to lose focus, he needed a plan. You can't do magic without a wand, unless…well, if children could do wandless magic, then how hard could it really be? Harry used all of his concentration, and fervently repeated finite over and over in his head.
Nothing was happening. NOTHING WAS HAPPENING. He had failed everyone. As if Cedric and Sirius weren't enough, he had one more person to add to the "Deaths caused by Harry" list. Thinking of how desperately he wanted this, and how important Dumbledore was to him, he used the last of his mental strength to make one final push. Miraculously, he found himself freed. He rushed up the steps, and even as he knew he might be late, he heard the dreaded works coming from Snape's mouth.
"Avada Ke…."
With one more leap, he came to stand in front of Dumbledore. The only thing Harry heard in the resulting chaos was a strong rushing sound, and then he felt himself falling, falling, falling….