Regulus was smoking before he made it to the roof, before he started climbing the spiral staircase inside the tower that lead to the roof, before he even made it to the tower. He left a trail of smoke behind him as he walked through the corridors of the castle, too focused on the thoughts yelling in his head to noticed the wrinkled noses and disgusted looks on the staff and castle residents he passed on his way. There was a lot to think about, Al was back, but Regulus couldn't be happy about that. Fate would be twisted like that.
About once every other step he thought about turning from his intended destination and just say 'Fuck it', give up. Because what was going to come of this but more digging at raw woulds that for Regulus had been almost ten months never healing? And this conversation, this new development only added a certain depth to these injuries.
Maybe it was utter and complete stupidity that drove Regulus through the door leading to the roof. He couldn't explain it himself.
He stopped just feet from the door and swallowed back about a dozen conversation starters, rejecting them for either being too blase or too blunt or too cold, or everything in between. This made for an awkward handful of seconds as Regulus just stared, mute at Al. Even his cigarette was forgotten in his hand.
"I-" the first word out of his mouth sounded awful. But once made it cracked the ice. It made the next awful attempt sound maybe just a little less awful. "Hey."