É mencionado no atributo Alternate Form, p19 (ênfase minha):
Whenever characters who have lost Health Points change form, their present totals are always adjusted proportionately: multiply current Health Points by their latest form’s base Health Points and then divide by their prior form’s base Health Points (Current Health x New Form Base Health ÷ Old Form Base Health). The same applies to Energy Points. This means that if a human with 60 Health Points was reduced to 30 Health Points after taking various injuries, and then changed into a cat with a base 20 Health Points, the cat-form’s current Health Points would be 30 x 20 ÷ by 60 = 10 Health Points. Suppose the shapeshifter then suffered further injuries whilst a cat, dropping to 2 Health Points; after turning back to human form, he or she would become a human with 2 x 60 ÷ 20 = 6 Health Points.
Enquanto estiver no atributo Alternate Form, isso se aplicaria logicamente a qualquer coisa que alterasse suas estatísticas.