Maybe Astina chocked her because she still has lingering feelings for the former king Theodore who is also reincarnated in the form of Theo. Remember when the teacher asked her opinion in the class and she stated because "Martina loved the former king" and how in the much older chapter Theodore probably asked Martina to do something out of love and asked if she truly loved her??? They probably haven't settled their old flame before dying. You could see how shocked she was after seeing Theo in his human form, the only difference is the hair color...I really can't wait for it to be translated

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Theo change into human form after Astina kissed him while sleeping. Astina shocked, and when she saw Theo's face he resembles the old king and Astina cry, then she choke Theo with his collar, Theo suffocated and Astina kissed him again while crying.
(/TДT)/