[Tony is not dying. Not yet, at least. He's miserable, water-logged, and bleeding from his right side where the Merrow shade dug claws into his flesh, but he doesn't actually look mortally hurt. He doesn't look that impressed by Hiccup's explanation, unfortunately, because he doesn't really know if he wants more explanation for where he is.]

Oh, good, it has a name. I thought it was just a park in Hell.

[Maybe it is. He looks from Hiccup to Toothless and back again.]

Thanks for pulling me out of there.

[He finally found his manners.]

It's an infection? Well, can we treat it? Someone else will probably come by and run into it the same way I did. We need to keep it from attacking anyone else.