The air around the two protagonists sparked and crackled as they grappled with each other and the stench of ozone filled Jack's nostrils.
He was frozen with indecision...who should he tackle first?
Blue light filled the air as the two suddenly broke apart, forced to retreat against the power of each other.
The Darkness stumbled back, taking a few steps to get his balance; he'd forgotten how powerful his brother was, even without his full powers.
He blinked away the static that fizzed across his body and straightened. "So, you do remember how to fight...good... no holds barred then," he snarled and launched himself at his brother again.
The Light knew he had to finish this and finish it soon. He knew he didn't have the power to destroy his brother, not yet. He had to get to his temple, he needed the rest of his powers to sustain this body; it was too frail to take the punishment.
He knew from the memories of this human that the Time Lord was the last of his kind, but he did not look like the Time Lords that the Light had known. There was something not quite right, something unnatural...but it was something that would have to wait.
First he had to get past his brother and into the temple.
He heard the snarled words of his brother and braced himself for the attack.
Jack warred with himself...who should he tackle first? If he could do anything at all, how did you take down two gods, if that's what they were?
He winced as his two friends clashed again, the sound of flesh against flesh nearly drowned out by the sparks that flew as they tried to get a grip on each other's heads.
If he didn't interfere would one of them die amongst this deserted city? What if they both died, how would he live with that?
He made a decision and moved but came to a sudden halt and when the Darkness... no it sounded like the Doctor screamed and started falling.
The Light watched his brother fall to the floor. It had been a stroke of luck when the human had appeared from behind the wall.
It had distracted his brother for some reason. It was only for a second, but it was enough and he pushed his attack.
He clamped his hands around his brother's head and began filling it with his own energy. He felt the desire to kill him rise and found he didn't want to resist it.
Then he felt it...the spark of something else...the Time Lord, he was still alive!
The Light cast his mind further in and saw something else. No wonder there was something off kilter about the Time Lord's appearance. For a fleeting second he wondered how in the universes the Time Lord had let himself be perverted by what were the scourge and pariahs of this universe.
Then he saw why, he felt the darkness in the Time Lord's mind...the hole left by his destruction of his own people.
The Light saw this in the seconds it took to overwhelm his brother's essence. He could have killed his brother then but the fact the there still a spark of the Time Lord left. He would have to revert a more complicated and much more painful way.
Yes, he wanted his brother dead, but unlike his brother he wouldn't do anything to attain his goal.
He didn't care about the tiny mortals that inhabited this universe...he had his own plans for them and for that he needed the Time Lord alive.
Yes, he feigned indignancy at his brother's possession of him, but that was only because he got there first.
But that would have to wait, he needed his full power for that, and for that he needed to get to his temple.
He also needed his brother to remain incapacitated and for that he would have to cause the already tortured Time Lord more pain.
With a mental apology to the Time Lord and in the hope that he would hear it he sent a huge wave of power against his brother.
He heard the Time Lord's scream as the pain seared through his body and let go, hoping that the Time Lord would be injured in the fall.
The Light turned away not paying any attention to the tiny human he descended, climbed the remaining steps and disappeared inside the building.
Jack watched in paralysing horror as the Doctor began falling. The scream had ripped through him...it was a scream of pure agony and Jack wished it had been the Darkness in pain.
It was only when the Doctor's body hit the stone steps with a thud did Jack's muscles agree to move.
He covered the distance between himself and the Doctor on seconds and he panicked when he saw blood in the Doctor's hair. With a wildly beating heart he checked the Doctor's ears; the blood wasn't coming from there.
He found the source as his hand touched a sticky patch at the back of the Doctor's head.
"Doctor?" he said, hoping his voice would rouse the Time Lord.
He was rewarded with a low moan, but he moved slightly back, wary of it still being the Darkness.
It was only when pain filled brown eyes opened and stared at him did Jack relax a little.
"Jack?" the Doctor moaned.
Jack was back at his side instantly and looking intently into the Doctor's eyes...it was really him.
"Jack, where...?" the Doctor said and tried to sit up.
"Whoa Doc," Jack said and helped him to sit up.
"What...?" the Doctor began but was cut off by Jack.
"Not now Doc, let's get you out of here."
So intent on getting the Doctor away that he never noticed the oily black colour begin to cloud the Doctor's eyes.
"Jack, we have to stop," the Doctor said and would have fallen but for Jack's grip on him when he legs gave way.
Gwen looked up when she heard someone coming. She'd managed to place Martha against the wall and had sat with her, flinching when the cracks of lightning had split the air.
She was relieved and surprised to see Jack...relieved to see Jack but surprised to see him carrying the Doctor.
She was instantly cautious. "Jack, what's going on?"
"No time to explain. I have to go back to that building. Whatever that Light thing is, it's using Ianto. Look after them, please."
Gwen nodded and could do nothing but watch as Jack disappeared into the night.
She turned back towards the Doctor and let out of a startled cry.
The Doctor was standing right behind her, his eyes closed.
"Doctor, are you alright?"
As the Doctor opened his eyes Gwen tried to step back, but she was grabbed by a strong hand.
"Gwen Cooper, it's been a while," and obsidian eyes stared back at her.