Sam looked at Dean and shrugged. He didn't seem to think the teenagers in front of him were important.

Except for one thing; "How'd you know how to kill it?" Dean asked, nodding his head in the direction of where the demon had disappeared. He still wasn't sure if it was dead. Where did the body go? Why wasn't there any demon smoke?

"We're shadowhunters. The Nephilim." Clary began, stopping short when Jace laid a clam hand on her shoulder.

Sam's eyebrows rose. "The Nephilim? You think you're the offspring of an angel and human?" Sam gave a stark laugh, Dean just looked at him.

"Wait; you're telling me that an angel- an angel- shacked up with a human?"

"This isn't right." Jace said lightly to her.

"We can hear you." Dean pointed out, bluntly.

"Well I knew that." Clary said to Jace, ignoring the two brothers. "We have to get back to the Institute, talk to Maryse; then again they're probably just madunes looking for thrills and finding the truth." Jace said, steering Clary in the direction of the exit.

Dean paused for a second.

"Excuse me?" He said. "Did we just get dissed by a couple of teenagers?" He turned to Sam. His eyebrows rose and he shrugged. "Doesn't matter; demons dead. Lets move on."

Jace&Clary POV

"Jace," Clary's voice finally sounded in Jace's muggled head. He had been thinking of the two men they had seen during the lower demon kill. They didn't have runes, scares, or anything pointing to the fact that they were Shadowhunters; but he had seen the way they fought.

"Did you see the way they moved? How the acted together instead of just going for the kill, working together to kill it together." He looked down at Clary, she had a small, adoring smile on her lips. "What?" He asked with his own smile.

"Nothing," She said with a laugh. "Just you; you're so fascinated, what made you leave before you found out who they were?" She asked, taking his hand as they walked back to the Institute.

"I don't know. I thought they weren't important at the moment." He looked up at the passing cars.

"And now?" Clary asked in a low voice.

"Now I'm curious."

Case POV

He saw it, the whole thing. He had no choice but to freeze with the Nephilim dove in. He would have went in and killed the demon for the brothers but they had gotten there first. He couldn't have stepped out in front of them, the Nephilim would sence what he was.

He knew of both the Shadowhunters who stood before the two vessels. Clarissa Fairchild and Jonathan Lightwood.

The two who held the blood of an angel.

Once they had left, Case moved in.

"What the hell? Do you have any idea what you just did?" He walked up to Dean and looked him in the eye.

"Didn't kill a demon? 'Cuase, honestly Case, that's all I can't think of." Dean smiled.

Sam clapped Dean on the back. "Dean," He said in a warning tone. "What?" He asked.

Cas raged.

"That was the Nephilim; offspring of Angel and Human. Cursed with ridding this planet of all its diseases."

"So like us?" He gestured to Sam and him. Case just stared.

"Joking!"

"This isn't something to joke about; they were suppose to find out about you two, and they won't. You see them again and you run the other direction; no questions." And he blinked out.