"I offer you Terrestrial currency."
The English-speaking Martian—the Martian who had admitted to speaking English—turned his head slightly and spoke to his fellows. There were clacking sounds as his lips met. The others reacted variously, one of them suddenly gesturing with what seemed a disgusted flip of his arm before he turned without further word and stalked away, his shoulders looking like the shawled back of a very old and very hungry woman.
"What did Burr give you?" Sollenar asked.
"Burr." The Martian cocked his head. His eyes were not multi-faceted, but gave that impression.
"He was here and he dealt with you. Not long ago. On what basis?"
"Burr. Yes. Burr gave us currency. We will take currency from you. For the same thing we gave him?"
"For immortality, yes."
"Im—This is a new word."
"Is it? For the secret of not dying?"
"Not dying? You think we have not-dying for sale here?" The Martian spoke to the others again. Their lips clattered. Others left, like the first one had, moving with great precision and very slow step, and no remaining tolerance for Sollenar.