He belongs in St. Mungo's, Remus thought with fear building in him, his own wand held ready as he tried to process more. 'Going back there' could only mean one place in his mind, because no place was as fear as Azkaban. Wandless magic was something Remus had been doing since he was in school himself (a wand wasn't exactly something one could keep on hand wherever one dropped exhausted in the morning after a change) and wordless magic had come not long after. He concentrated even as he stepped back, one hand held in signal for Draco to remain where he was, putting a shielding charm over them both. Defense had always been his top marks.

"Draco, talk to him," Remus said quietly to the young man beside him, "but whatever you do, don't go to him. He's likely to blast me the moment you're at his side, if he even recognizes you like this."

And to Lucius, he spoke louder. "Your son is right here with me, Lucius! Narcissa is in the house this very moment waiting for us all to return to have dinner. Lower your wand, see what's really happening around you!"

The first sign of that wand moving in a spell and Remus was going to disarm him. He wouldn't hurt the other man, but he would not let himself, or Draco, be injured.