They were gathered in the briefing room, but they weren't talking. A monitor had been brought in so that they could keep track of what was going on inside the operating room without standing outside the door looking in the window. It was too far away to show any bloody details of the surgery – which was fine with all of them – but they could see immediately if something happened that required the security teams that were standing outside the door.

Daniel wasn't watching the monitor. He had been to his office and had books piled on the table in front of him as he tried to figure out the origins of the arrowhead that Carter had taken from around the stranger's neck. Oddly enough, he wasn't having any luck. As far as he could tell, no tribe ever in the history of the planet had ever made one with the weird jagged edges that this one had.

He sighed, and pushed the last book away from him, disgruntled.

"Nothing?" Sam asked, understanding his frustration. She hated it when something she was working on wasn't coming out right.

"I've never seen anything like it." He confessed.

"It's not Ute?" Jack asked, innocently. When Shawn had found the one that he'd eventually given Jack, the tribe of origin had been a big deal among the kids that had been there.

"It's not anything," Daniel complained. He sighed again. "Are you wearing yours? Can I see it?"

Jack wordlessly reached under his shirt, pulling out the necklace and slipping it off over his head. His look told Daniel everything, though, as he handed it over to his friend. Look, but don't mess it up. Daniel wouldn't have dreamed of doing anything to it, he knew what it meant to Jack.

Daniel looked at Jack's, comparing it to the one they'd pulled from the stranger's neck, but there wasn't much there. The leather was similar, but leather was anyways, so that wasn't much help. Jack's arrowhead was, definitely, Ute. Daniel had known that when he saw it the first time, and this other one was something completely different.

"Beats me," Daniel said, handing Jack's back to him.

"Maybe it's not from Earth," Sam said.

Both men looked at her.

"Well... he's on an SG team, isn't he? What if he picked it up somewhere off- world?"

"He's not on an SG team, Carter," Jack said, irritated. "I know all the people on SG-1, and he's not one of them."

"He could be," Daniel said. "If Sam's right about the whole going back in time thing."

Jack scowled, and looked over at the monitor where they could plainly see Fraiser working hard to save the life of the young man.

"He's not."

Sam had a feeling that Jack thought she might be right, but that he didn't want her to be. If she was, then it meant that it really was Shawn lying on that table, and that wasn't something Jack wanted to deal with. It was easier to assume he wasn't. And Sam had to admit it was entirely possible that she was wrong and it was some kind of Goa'uld trick. Although they knew for a fact, now, that the man himself wasn't Goa'uld.

"He could be," Daniel pressed.

"If he is a member of a future SG-1, then where are the remaining members of his team?" Teal'c asked.

"Exactly," Jack said. "When we went to 1969, we all went together."

"Maybe they got separated?" Daniel asked.

"Or maybe it's a snake trick."

"Or maybe not..."

Jack was about to retort in usual fashion, but there was a flash of bright white light, and they all turned to see that Thor had joined them in the briefing room.

"Thor!"

"Greetings, O'Neill," the little alien said, nodding to Jack and then to the others in the room, including Hammond, who'd been in his office with the door open and had seen the light and knew what it meant.

"Just the man we wanted to see." Jack said. Then rethought that. "Alien, I mean. Well, you know what I mean."

"We received your message," Thor said, taking Jack's comments in stride as he normally did when he didn't have a clue what he was talking about. "What has occurred?"

"About an hour ago, we had an unauthorized gate activation, and the young man that came through is somewhat of a mystery." Hammond said before Jack could say anything.

"In what way?"

"He's carrying identification that makes it appear he's Shawn." Sam said.

The Asgard looked at her.

"Our Shawn," Jack elaborated.

"Shawn Adams?"

"Yeah."

"That is not possible. At the moment, his current location is Roosevelt elementary school."

"That's what I told them," Jack said.

"Thor? Is it possible that he's from the future?" Sam asked. "That maybe an accident with the Stargate sent him here, somehow?"

"It is highly unlikely, Major Carter." Thor said. "There would have to be a precise-"

"But it could happen?" Sam pressed. "If everything happened exactly wrong? A solar flare near the wormhole at the point-"

"Is there any way the Asgard can make certain?" Hammond asked, interrupting before Jack could.

"We could compare a DNA from the boy with a sample taken from the man," Thor suggested.

"That's what we were going to do," Carter said.

"Our results would be instantaneous."

"We'll let you do it, then," Hammond decided. The less time they had to wait, the better.

"If you supply me with the samples, I will return to my ship and make the comparisons," Thor told them.

"I'll tell Doctor Fraiser we need a sample," Hammond told the group. "Jack, you take a medic and go to Shawn's school and get some blood from him."

"I'm not so sure that they'll let me walk onto the playground and start pricking their students, Sir."

"We'll call ahead and make something up by the time you get there."

"Don't let him know what's going on, Sir," Sam said.

"Why not?"

"Because if I'm right and it really is him in there, we need to keep him as far away from Cheyenne Mountain as we can. To keep his own future safe."

Jack didn't even pretend to understand that, he just shrugged and nodded. "Come up with something and call me and let me know what it is," he told them, walking for the door.

"I shall accompany you, O'Neill." Teal'c said, following him out.