Felix wasn't actually trying to suggest that Linhardt was stupid, but with his attitude who would ever know the difference? It's dismay that hits him, though, when Linhardt says they don't know how. How long might he be stuck here?

"I don't have an idea. I've just never heard of anything like what you said."

His frown deepens the more Linhardt explains. "All right," he agrees slowly, finally. "What are the different versions you've heard of so far?"