James had been talking to Remus, keeping an eye on Sirius and uncle Ron, but when things exploded neither stepping in between them or hexing was an option. James ran toward the two, his attention on Sirius at first.
He held Sirius' chin "Hold still. Let me fix this." He took his wand and cast a healing spell. He winced in sympathy as he heard the bones shift. "Sorry," he murmured. He knew it hurt, but it was better than the alternative. He cast a cleaning spell and when he was satisfied that Sirius was all right he turned around.
"I don't know what the hell you think you're doing, but stay the fuck away from my business. I told everyone, because I thought I was dying, not to invite opinions." He looked around and raised his voice to address anyone who wanted to hear. "I don't give a shit about what any of you thinks about us, so don't tell me, and don't make me choose between any one of you and him, because Sirius is family just like anyone here." He stared at his uncle. "I think you owe him an apology."