There is a point during the scene in there where Karina questions if they should just allow Yoshida to take the crystal's power. There's a brief pause between dialogue boxes, and you need to press UP at that point. However, Ashiee says that the trigger does not seem to be working properly right now, so you might want to test. I intend to make it a bit easier in the next version, but this is definitely an easter egg. =)