NCF – Extended list of Neutral creatures.

During the jump, they have their own model. So, even if you give a jump ability to fire demons from the elder demons, the model will change to that of the elder demon during the jump and revert back upon landing.
The same thing happens with ents; during the rooting animation, the model of the ancient ent changes to that of a new ancient ent, which has its own animation set.
Therefore, if you give wild ents the rooting ability, they will turn into ancient ents during the rooting animation.