"Yes," Sam said. "I need to know if the tesseract takes you. I can't find out from that stupid-- advisory notice thing." He supposed there might be some other system in place for SHIELD to notify friends or family, but he hadn't gotten contacted yet. He didn't have any concept of how long it had been since the phone call had ended-- logically he felt that it couldn't be more than a half hour, but emotionally it felt like it had already been days-- but it was already too long. Too much time for his brother to be gone and him not know.
With Cas, it could be even longer. Even two hours was too long, really, but it was unreasonable to ask for more than that. He just needed the angel not to disappear, because he needed to not end up stuck in this universe alone. Without his family. "I know. It's just-- it doesn't matter. Never mind."
He sat down on the couch and buried his face in his hands. He was exhausted, wrung out, from being terrified and panicked. Soon enough devastation would set in; it had already started. "More than needing to know if you do get taken, I just need you not to leave."