The man looks relatively inoffensive at least -- not visibly armed, irate and own his own. Lancelot considers him a moment before flashing a small smile, stowing his notes in an inside pocket and lofting an eyebrow questioningly.

"Can I help you?" he prompts curiously, unsure exactly what he might be lingering for. He could just be lost, he could recognise Lancelot from somewhere and he's simply failed to recognise him in turn. It could be, of course, that he's either overheard or been told why Lancelot is here. That would be useful.

He could also be about to get mugged, of course. That would be a lot less useful.