Harry lightly touches Regulus' elbow, not much but it's a physical gesture of support. He may not know him well, but he can appreciate the loss of a friend. "We didn't really care for each other as much as we could've, but I am sorry."

"I can't promise that I won't have a proper bout of midnight terror as it sinks in, but I can listen and walk." Or he can be quiet as they make their way up and off the beach. Wrinkling up his nose, Harry tries to run his fingers through his tangle of curls and get them into some semblance of order. There's going to be sand and bits of twigs in everything.