 It hits in the ocean in a way that brings up a lot of toxic gas and effectively incinerates the dinosaurs because the surface temperature went up to about the same level as a broiled chicken. I mean, it was deadly, right? Now, the reason this is important is because if it had hit a slightly different place on the Earth, the dinosaurs probably wouldn't have died out. And let me just point out, and you mention this in the book, it's not like if it hits a different continent forever.