Fortunately, Helen is rather accustomed to the unusual. And while it doesn't really explain to her why his symptoms so resemble a dangerous case of the flu, it does confirm her recent suspicions that it isn't an ordinary illness. That at least gives her something to work with, and reassures her that it likely isn't contagious.

"Interesting," obviously referring to the bit about cosmic consequences affecting the body on a subatomic level. Though, admittedly, she is rather curious to know how he'd ended up trying to close the gates of Hell, especially since she's not even certain she believes that Hell exists. And then, thinking out loud, "I wonder if it's similar to the radiation Adam and I were exposed to." But that damage had been at the cellular level. This poses a much greater concern. She only hopes it won't prove to be quite as deadly.

"Tell me, why were you trying to close the door? Is that what did this to you?"