The dog doesn't seem hostile, so Enjolras will amicably mostly ignore him. He can be prevailed upon for some perfunctory greeting ear-rubs if Liranan wants to insist upon them, though.

(Sorry, Liranan. Enjolras isn't much of an animal person.)

"Hello, Warden." It's a formal title, but he says it amicably, in the same tone he'd say her name if, well, she were a man. The narration apologizes for the 19th century in general and Enjolras's formality in specific.

"Are you -- learning sword-work?"

Okay, he knows she's not a delicate sheltered lady, but still. It's not an immediate assumption.