The serious expression of Emeia changes to a surprised one upon the discovery the other ones found in the library. "But if we already met and you are sstill asssking that... That would mean--" instantly she petrified her body to a semi-indestructible stone-like-material, right before a ridiculous amount of electricity surged through the sewers, easily frying anything that wasn't resistant to it.
After the electric assault the snakegirl de-petrify herself and continued, "--That would mean sssomething prevented me from explaining it." Taking that likely Raleigh was still present somehow, Emeia says, "My sssnakess located the attacker nearby. Follow and I'll explain on our way there." She didn't wait for an answer though and already started dashing through the tunnels.
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The Emeia at the library pauses for a moment from reading, murmuring, "I might have found a lead.." Then continues back into the book of habits and reads what Raleigh does to those that are hostile to him.