Jack had no time to think as he went down - to hope that everyone was right and he really would get back up again. He just went out and went down, straight into nothingness.
Next moment - or so it seemed to him - he was hurtling back into awareness, heart hammering in his ears and gasping loudly. He coughed as something tickled his nose, but forgot that in the sharp, panicky terror of realising he'd died. He'd died, and come back to life. And everything seemed brighter than before. Sharper. As if his mind was more open somehow.
He scrambled backwards, heart jerking in his chest, as he looked for the Master.