"That would only be useful if you intend to bathe in it," Starscream deadpanned. Behind him, his wings give another flick to dislodge freshly accumulated snow.

And then, in seeming concession to recognizing Genji's offer as well-meaning, he actually elaborates. "The quantity is not the issue. My kind subsists entirely on a specific fuel source. I could no more put that slop in my tanks than you could put mercury in yours."