It wouldn't surprise him in the least if the combination had sent Lucius' mind back. Damn, he should have offered to go out with the other, given him some sort of protection and kept his mind focused on the now, but he had no idea it had become this bad. It was something that could be dealt with separately; right now, he was more focused on getting this handled without anyone being hurt. It was, however, deeply strange to hear one of his former students calling him 'Remus'.

"I came to help capture the dementors and nothing else," he reminded gently, knowing they had pushed in the right direction. The lowering of the wand was a good sign, but it didn't mean they were out of the woods. "Draco and I were only waiting for you to return from setting the protections against them, remember?" Please, please remember.

His own wand hand was steady, even though in reality there was a deep tension as he stood ready to react to the former Death Eater's any poor reaction.