There is a behavior called Valerian Hero Death Prevention which I'm sure you all are aware of. If a unit has this behavior the unit when it reaches it's death point will apply an "incapacitated" behavior to the unit preventing death. 4 models in particular have animations that trigger when the behavior "Incapacitated" They are: Raynor, Swann, Stetmen, and Tychus. IF, you put the "Hero death prevention" behavior on a different model (let's say Zeratul) when Zeratul reaches his death point no animations play he just remains in "standing" form.
Here is the question of the day: What do you need to change to allow a certain model to play (or be swapped in) for other units during this "incapacitated" behavior state. Here is an example I would like some help with. Let's say I have a hydralisk that has this hero death prevention behavior equipped, and when the "incapacitated" behavior is applied, I would like the hydralisk to burrow and then when the incapacitated behavior is off i would like him to unburrow.