Remus shot Sirius a look 1/3 affectionate, 1/3 wry, 1/3 mournful. "I'm not as good at running as" before "you." Nothing like what Sirius had been through in Azkaban, but the years had been harsh on Remus too, aging him more than their number. Though he loved Sirius for not thinking about that. Possibly he was imagining them school-aged again. And not the first time forgetting that Remus couldn't become Moonywolf at will. "Can probably make it to the cave, though. …Don't hold back for me, by the way. Transforming. As long as you circle 'round again."