It was only a few short moments after Regulus had headed back into the party before he'd removed his mask for the first time that evening. He let it dangle between his fingertips and looked around the room for someone to talk to.
He spotted Melinda over by herself and smiled - for her being here at the party and about how she'd helped him the night before. If it hadn't been for her, he probably wouldn't have been able to keep Sirius preoccupied all day.
Regulus walked over to her and smiled warmly, "Miss Bobbin. Glad to see that I didn't manage to scare you away from attending my brother's party. And thank you, really, for taking care of me last night." He was still mildly embarrassed about how he'd acted around her, but she didn't seem like the type to hold it against him.