You could put a breakpoint on that data and see when it's accessed. Still, there's a lot of careful tracing and watching from there on in.
Are there any enemies that have identical AI behaviours? I'd expect that Tiamat and its Crystal version to act the same, even though they have different stats. If their scripts match, a comparison could provide clues where to look. The knights that accompany Steiner in the boss fight have the same behaviour and attacks, so they could be worth looking at also.