He stared at him for a few moments, analysing every part of him. Severus was older but there was nothing to scream it was a trick of Rookwood or of his head. Essentially, it told him nothing and that was frustrating.
"You're a trick." he said eventually, sounding hurt. "I don't know quite what but there's no way that you're him. Either you're some Death Eater berk trying to make me confess something I've thought about and seal my execution or I've lost the plot and you're some Healer in St Mungos and it's my brain trying to tell me something."
He swallowed , looking up. "And," he muttered a little louder than he wanted "If this is my head messing around then...stop it."