Remus had been minding his own business--he was studying in his room when he'd heard the shouting in the common room. He'd been unimpressed to find it completely trashed that morning, but Sirius had apparently gotten the elves to start putting it back together. Had he not had a test and an essay to finish, he probably would have been a bit more involved, to tell the truth.
When people started pouring out of Gryffindor to go find one of their own, Remus really knew something was wrong. Checking his journal, he heard Keenan screaming to find his nephew, and McGonagall asking them all to go help her find Chase Harper. What had the boy gotten himself into now? With a sigh, he'd put his robes on, grabbed his wand, and raced off to catch up to his Head of House.
Only now did he do so. Looking a little more worse for wear, with the full moon practically upon him, Remus felt exertion from even the simplest of things. He offered a waning smile to McGonagall and then a nod to Arthur and Glee. "I haven't seen him," he reported lamely. "I just heard the noise--and the request to aid in locating him. Should we stay with you or split into groups and try to round him up?"