All About Battle Events

Tracing the code with the debugger back to the animation bytes (Same bahamut example, 0D 05 00 01) leads to:

Code:

Headerless!
D0/8E05: 10
D0/8E06: FF
D0/8E07: FF
D0/8E08: 30
D0/8E09: 02
D0/8E0A: FF
D0/8E0B: FF
D0/8E0C: 00
D0/8E0D: 00
D0/8E0E: 00
D0/8E0F: 00
D0/8E10: 42
D0/8E11: FF
D0/8E12: FF

And I don't have any idea how that works. I tried summoning custom espers, but it seems like a specific mold is used for each esper. For example, replacing Bahamut by Alexander will only summon a glitched Alexander sprite.