Ben said good-bye to Michael and Wren, promising he'd see them later in the week for dinner. He spotted Al and Professor Snape, and headed over. He waved hello, because he'd heard about Al's hearing loss, and used his wand to write as he spoke.
"Thank you for coming," he said (wrote) to them both. "How are you healing?" He remembered from when Al was his roommate that specific questions worked best, and as long as that meant that Al didn't use his piano as a writing table, that was fine. Not that the two really had anything to do with the other, but he would forever associate Al with that particular atrocity.