Martha and Jack
Jack felt both his smile and general good humour falter as everything he didn't know in particular hit him all at once. But wait, he was fine. This wasn't him going alone after an alien nor finding out the team was sneaking certain items out of the Hub purely for selfish reasons. This wasn't Suzie Costello killing herself.
Wait again, he didn't recall how he arrived here, at least not the part involving the dead tentacled thing outside.
Somehow it all had to lead back to the Doctor and Martha's question about the hand confirmed this.
"Bye and thanks," he said to Faith and Angel when Martha grabbed his embodied hand. "See you later."
Well she was right about the room having a sense of familiarity. But Jack ignored that as he raised his hand and hers along with it, looking down at them. "This feels like I do know you or at least like I should." He looked up at her. "And since you know about the hand, you have the advantage."
He moved away, shrugging out of the backpack and placing it down. Jack lifted a special container out of it, which he place on a tabletop. The liquid in it seemed to be boiling around a disembodied hand.
"Alright, where's the Doctor?" Jack demanded. "He's the reason I'm here." Which was true on several levels at once.