Toby's surprised by the female voice, actually. He wasn't even considering the fact that there would be more people in the common room. Of course there would, but still. He just didn't give it much thought.
He turned to look at her. He had seen her already, walking in the castle by Bellatrix's side. He figured all of Bellatrix's followers would be racist biches, but apparently he was wrong.
Or not, he thought. Maybe she was trying to make fun of him? He wouldn't know without talking.
"I... was thinking of keeper." He answered, looking back at the bulletin board, as if he missed something.