Opening the door to his quarters, Remus didn't need to look far to discover the source of the commotion. Merely turning his head in the direction of Regulus' office was enough to see something had just happened. Something he and Pads had missed most of as now only Rose was standing in the hall, looking murderously at Regulus' closed door.
Bloody brilliant.
"Rose?" He stepped out into the hall, but waited for Sirius to step out as well before closing and sealing the door behind them because he knew his friend well enough to know he wasn't likely to sit idly in Remus' rooms while there was excitement somewhere. "What on earth is going on out here? Who were you arguing with?" There was a chance he could have misheard through the walls and charms of his quarters, but Remus doubted he could mistake that particular voice. Still, he could be wrong.