We are told in the episode that Drogo has a mortal wound and will die within a small number of hours. And then the blood magic starts.
The reviewer mispeaks when she says that "it was heartbreaking to watch Drogo die of a simple infection". That's not what happens in the episode (or in the book). If she had used the word "dying" instead of "die" it would be more accurate. The effect of the blood magic, if there is to be any, has yet to be seen.
It's worth watching next week.
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