In Halo 3, I have noticed that the infection forms and Pure Forms seem to be killed easily the moment you use fire, especially the Pure Forms, but when doing it to a combat form, they seem to be able to last a bit longer before dining to the fire damage, is there a reason for this?
Flood Biomass itself is extremely weak to fire. But a Combat form is also made of the flesh and armour of the victim. But I’d imagine the real reason is for balancing purposes, since Combat Forms are weak to bullets and also melee, a weakness Pure Forms do not share.