Also this form had description that one head is malevolent and the other is benevolent. Judging from the fact that the other head didn't try to eat allies and has support skills it's a benevolent head, how lucky for our MC to get a malevolent head role.
Cause otherwise it would be very hard to execute a rescue.
Given the male-female dichotomy, it makes some sense. The male head is the offensive one, the female head has support defensive abilities. Really lucky that the head capable of leveling cities is more rational (probably)