Neville saw him tuck away the wand. He didn't think anyone else here was like him. Not since Harry had gone. Maybe he was new? That would make this a lot harder to explain.
He helped the other man up, "It's ah..." he hesitated just slightly. If this was someone from his world, and they didn't know about what they just saw, they were either from before it happened or very far in the future. But maybe it wasn't even someone from his home, maybe there were others that used wands like his. "It was sort of like a manifested hallucination." he rubbed the back of his neck a little. "It wasn't real but...yeah." he just said awkwardly.
Ruby chose that moment to make his presence known again, apparently deciding it had been long enough for him to be ignored, leaning around Neville to sniff at the new man. Neville hooked an arm around the base of the dragon's neck and tugged lightly, not enough to actually pull him, but enough that he knew he should back off. "C'mon, don't be rude." He glanced back at this new person. "Sorry, he's a little too friendly sometimes."