After he learns what's happened, Remus stays just long enough to make sure that Regulus is okay. He knows he can afford it because he knows that Sirius will need a bit of time to process and to cool off. He also knows exactly down which sort of self-destructive path the shock of the night is like to lead Sirius, so it isn't long before Remus is stepping out into the cool night air to search for him.

It's a moment before he spots Sirius, his rigid suit-clad back blending into the darkness, feet surrounded by a growing pile of cigarette butts. Of course it's now that he starts feeling hesitant, but this isn't something they can just ignore. Not now that things are out in the open.

"...Sirius?"