Why is Cappuccino wearing a Pyro Delusion when she has a Pyro Vision, is she stupid?

Delusion is made to transcend the inner capacity of an elemental vision, by compromising one's own health and life time they can increase the potency of a vision.

it's given that every harbinger has a delusional vison given by Dottore :D

every habinger have a delusion and a special "armor"