Area of Effect, Difficult Terrain (Ice storm, et al.)

[Gwiber]

Spells with a listed area of effect that cover particularly not just the ground, but up into the air.

In this case it was Ice Storm.

Flying Shaman gets caught in an ice storm, takes damage, but when next he starts to move, does the Ice Storm count as difficult terrain for him?

Does it only count as such on the ground? Or does it work in the air too for the flyer? And/Or does the method of movement negate the issue?

[Gwiber]

Mo one has any thoughts?

[Saethori]

The rules for difficult terrain does not actually say flying creatures are exempt. It's just that most difficult terrain is limited to the ground.

Ice Storm definitely says the entire area, which extends 40 feet high, is difficult, and still has sleet and snow, so I think fliers are impeded.