"The bottle?" Zacharias echoed, for a moment not having anything pop into his mind. And he was rather perplexed as to why the other was still sitting on the ground. Most people leapt right back up when they tumbled down to the ground, on account of the ground being... well, rather dirty. And also, not terribly comfortable.
"Oh, bloody hell!" he exclaimed when he realized what Merlin could be referring to, and for the moment, he didn't wonder how Merlin knew it. "The oil." He sounded exasperated but then blew it off in a sigh.
"I don't need your money," he said, because he really, really didn't. "Why don't you get up off the ground? You look ridiculous down there." And Zacharias, standing there talking to him, looked vaguely ridiculous by extension.