Jack was so busy rushing ahead, sparking off his own excitement, that he was forgetting to be aware of his surroundings. He was forgetting his own codes that he'd developed over so many years. In many ways, it's a good job the excitement had taken hold, else that fact could make him quite annoyed, annoyed at himself and angry. That'd do none of them any good.

He stopped sharp as the Doctor called out, and swung around to him. "What is it?" the excitement was fading and for a moment he worried what it'd be replaced with. He worried what was ahead of them, and what might be behind.

He was worried. Damn. He tried to control his breathing, but it was hard, and the corridor suddenly seemed smaller and much more terrifying.

He looked down at the floor and at the colours in the tiles. He'd not seen anything like it before, but he was sure whatever it was it was terrible. "What does it mean?"