"Or a different tactic. Use this as a diversion, or part of a larger plan, but not rely on it entirely."

That leaves him frowning still, though, because what the hell else is there that they can do?

"I don't know if any of it is left in there or if it dissolved like the spirits do, I didn't see. But maybe if there's some part of it left, the scientists can figure out... something."

The poison idea that Javert had mentioned, or maybe something he just hasn't thought of. He's no doctor, no chemist.