Ugh, Claudius? Luo Binghe doesn't know about the other; they've never met.¹ But Enjolras didn't say he liked Claudius, he only said they've spoken. Luo Binghe will magnanimously extend him grace. He is a new arrival, and Luo Binghe himself was initially swayed by Claudius' wiles. "I would take care with Claudius. He is not so sincere as he seems." He gestures to the musket. "What need have you for such a weapon?"

Luckily for Enjolras, Luo Binghe has no interest at all in who his friend from home is or what their relationship might be.

¹Yes they have.