[Crane's eyes briefly flash with excitement. He's been meaning to do it anyway, but to hear the suggestion phrased academically was pleasing. It was right that he was talking on his proper level.]

Yes, yes. I would.

But the active ingredient is one of a kind.

[No need to ask if Walt sees his problem.]

I am curious whether it exists in this world. Though it seems these... creatures... share our rules of physics and emotional tempers. But I conclude there is the potential for a viable substitute.