Seamus' revelation about Parkinson was hardly news to Neville, but could be Seamus had heard something he hadn't.
"Twitchy how? Do you think she knows?"
Despite being in the Gryffindor common room, Neville didn't like to name Dumbledore's Army. It felt like the Carrows had eyes and ears all over the castle, and their common room, though certainly a stronghold against the Carrows' influence, was still right in the middle of enemy territory as far as Neville was concerned.