Sirius swung wide one last time not putting enough effort into it to care if he hit him or not. "I'm sick of you," he said once he'd caught his breath, as Regulus walked off. "You should stay, you stupid fuck. The Order can help you."
He crouched down, breathing heavily. He didn't fancy looking in a mirror or the pain he'd be in once the adrenaline from the fight completely wore off. At least he'd have a couple of bruises and maybe a cut or two to regale people with stories about.