Remus stilled himself although he kept his hand out. If she wanted to be left alone, he had no right to pursue her.
"This thing...?" He didn't quite know what she was asking there, though. He moved his wand a little by his trigger finger so that the light rose and fell an inch. "It's lumos," he said hopefully helpfully. "Lumos sets your wand alight..." That was common knowledge.
But that was the thing, it was common knowledge. She should know it at her age unless she was a squib but for all their lack of magical powers, squibs still understood how wands work.
And then it dawned to him. Holding his breath (and he must have lost some color there), he realized that she was a muggle. All along, he'd thought she was a witch because he'd thought she was a Death Eater but her whip wasn't a wand turned to a whip, it was a whip in all essence of the word and object a whip!
"Oh God," he hissed to himself as the light shook a little in his grip. You're a muggle, he almost added but he was smart enough to keep it to himself this time. If Remus could hit himself right now, he would have done it, though. "It umm..." he dampened his lips as he thought of an excuse, "...is a toy. This thing, it...a light flasher. It's a light flasher." Muggles have that, don't they?
"We must get you to a clinic," he offered hastily after, glancing over his shoulder as he stepped closer to his suitcase. Get her to the clinic, wipe her memories of him, then beat it. He was grateful for her help but the fact remained that she was a muggle.