They'd just locked up the shop, and seeing as it wasn't smelling particularly wonderful at the moment Fred decided that taking a walk through the alley would be a good idea - particularly as he thought he'd seen a hag hanging about the doorways, and he'd been able to sneak out the back before she saw him and starting thinking again that he was George.
He stopped and looked in the window of QQS before he even noticed who was standing about him. When he did, he grinned - more because he remembered the bloke's name than because he had anything productive to say to him. Just when he thought he'd had it, though, the bloke started walking off.
"McLaggen?" That was right, wasn't it? He thought he'd remembered his name, at least. Yelling it as he double-stepped behind him to catch up to his side would at least get his attention, even if the name was wrong. "What were you mumbling about?"