Thankfully, Remus Lupin was a person who could handle freak outs of most origins. He was naturally gifted at being a good listener and giving advice in a way that people could understand; some things, like being hated for no good reason, didn't sit well with him and were more difficult to handle, however. Regulus wasn't such a prat just yet, though, merely a whiny kid that made Remus feel like a babysitter.
Actually, he was quite surprised he said sorry, even though it was drowned out by a new onslaught of complaints. "But you want to be here," he reassured again. Remus was about to rant on about how they were outside waiting for Sirius in the first place, so why would they go in without him? If he said he was coming, Remus doubted he would go back on his word.
And, there! Before Remus could even say something, Sirius had appeared before their eyes - looking damn well, unfortunately - and shoved Regulus' words back into his mouth. EVen though it was also a lie. Like a frightened animal, though, Regulus panicked and almost fought him right then and there, too quick for anyone else. As the truth hit his face, Remus couldn't help but laugh, turning his mouth against his shoulder to cover it up with a cough. And then it was even more miraculous, seeing how close Regulus actually was to Sirius these days...He was hugging him and overall really comfortable. Clearly they had something - but how Sirius could think that boy hated him was lost on Remus.
"Right," he turned to one of the doors nestled into the back of the Hall. His wand had somehow made it into his hand and he waved it, producing a soft clicking sound without having to say anything, which made him grin. Of course Remus never actually bought tickets to see the symphony, they were entirely too expensive for him. He'd only done it once and decided from there on out, he would just sneak in: the London Symphony Orchestra was too great to miss, even if it meant doing something illegal. He stood back and held the door open for the brothers, a true Marauder's grin on his face.