When creating a custom animation in tools like FEBuilderGBA , you use a text script to define the timing of the "Human" to "Cat" transition.
In Roblox, an "FE" script allows animations and transformations (like becoming a cat-human hybrid or "Neko") to be visible to all players in a server. Human Cat FE Animation Script
Human character assumes a crouched "pounce" stance. When creating a custom animation in tools like