the lack of hints of him falling in love with her or the depression of his mom's death. The depression part is the most obvious core of his principles and his motivation. It's the catalyst for the entire one shot. It wasn't even hinted -- it was outright displayed to the reader. As for the falling in love bit, there were many hints that a romance was budding (pardon the pun haha). The willingness of him to talk to her, the mentions of him explaining many biological things to her, it's all there.