"Of course you would," he teased and there was no doubt in his mind if it wasn't for the presence of Mr. and Mrs. Potter, they would have done just that. He was taken by surprise by Sirius' sudden panicked outburst, as if Sybill's presence might cause him to burst into flame or something (though, he would admit, she was...odd.) Unfortunately, Sirius' sudden move placed him in quite the precarious position. Not that he was entirely complaining, but considering the situation it was more awkward than good for him.
If not for carefully practiced calm, he might be hypervenhilating. He took a deep breath to calm himself, but that proved to be a terrible idea. All he managed to inhale was his scent, which entirely clouded his senses. Get it together, Remus. He bit his lip, unconsciously holding his breath now with Sirius so close. Merlin, how was he going to make it through the whole concert without going completely mental? Again, with that carefully practiced facade of serenity, but would he manage to pull off pretending there wasn't something on his mind? Maybe...maybe not.
"Is she gone," he asked softly, completely unmoving, not meeting his gaze, not yet, lest he give too much away.