A wolf? Loose in London? Perhaps the man means a... wolfhound? Or something that looks like a wolf, a malamute or husky? His first instinct would be to call this equally the work of drugs of alcohol but... no, his pupils aren't blown out and his injuries --

His injuries have been done by an animal, or at least he hopes they were.

"You need to see a doctor," Lancelot advises, "you may need stitches. May I see...? It's all right, I've been trained in first aid. I'm a police officer."

Which he hopes is reassurance enough that Lancelot can and will help all he can, although it may not be if Faolan is nervous of the police. Plenty of people are, he knows, enough that even an off duty officer may make them feel uneasy.