[Valerius]

If you issue the change shape command, after the battle the game will issue another change shape command. It would seem this is intended to return the unit to its original form, in the case of a unit with two shapes. Since skrattis have three forms it's a problem for them. With your build you won't be risking losing equipment due to the second shape change but I'm guessing if you had to fight two battles in one turn it would be an issue since you will not be in the correct shape for the second battle.