Harry had been avoiding Ron and Hermione, trying to give them some space, which left him sitting and talking to Luna for a while. Harry usually found Luna to be an oddly soothing presence, but his guilt over her father made that a little harder to feel, and Harry eventually settled down, letting her nod off to sleep while he flipped through the children's book Hermione had made endless notes in, not seeing anything they hadn't already looked at dozens of times, but doing it anyway.
He looked up as he heard Bill call him though, looking over toward Luna and then slipping out of his seat and walking over to Bill, giving him a slightly wan smile. "Something wrong?" he asked.