Re: Lily, Sirius, Prongs?
Sirius couldn't move, couldn't think at all the moment he felt that chill seep down his back, like something out of one of his nightmares but so much more real than anything his mind could have ever come up with on his own. he knew before they'd gotten the message - he could feel it. And then they were out in the corridor, out there with those monsters and Sirius froze.
Quite literally froze. And it was only thanks to Lily and Jamie that Sirius got off that floor at all, being forcibly removed until that all enveloping sense of dread had lessened enough so that he could breathe again and he could think something other than no over and over again.
He took a breath to steady himself, he could still feel them, even a floor down - he could feel them coursing through his veins, but here he could think, he had some sense to him still and he could help - if only for the moment.