I've been searching through the World Editor and I've found how you can easily increase a unit's animation speed by just typing a very high number. However, is there a way to make the animation speed a negative number, so that the unit will be performing its animations backwards (Example: A Footman's Death Animation backwards - instead of falling on the ground, he leaps up back to his starting state.) Can it be somehow done by JASS or GUI?
However, for that specific qn, I think if you play the Stand anim after the unit is in the Death anim, it will play the Death anim backwards so as to get the model back to where it was.