Do you mean death in elemental mode? You can use back2human then death animation...or maybe end the back2human animation after the flame burst to make him disappear into flames.
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That's a tricky one as he falls down to the ground after death, and transform starts with him being up. Maybe use death, then start the transform from the fire tornado frame so it looks like he falls to the ground, fire tornado appears, and he turns to rage mode. The effects can also be separated in the aseprite file if you want the tornado effect only to play after falling down or something. :)