Coming into the courtroom at the defense of Liwliwa, Sana is polite, but genuine in his defense of his love. As more and more holes in his story come through, however, Sana becomes more and more defensive, not wanting to think of his love like that, and his alibi for her becomes increasingly more and more hectic and unconvincing.
Finally, the kicker, the defense postulates that this was all a scheme by her to use Sana to build her alibi. Pushed over the edge, Sana refuses beyond any logic, "No, that's not true! That can't be true, they wouldn't!" he yells losing all composure and breaking down into tears, becoming unresponsive afterward.
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I find the idea of him being largely quiet and having to paint in the middle of trial in order to convey what he's saying funny, feels like a particularly "Ace Attorney" way of presenting someone VVV