"temporary fortifications" and flying units attacking

By JonE, in Horus Heresy

Hi all,

My friend and I are new HH players, and have encountered a potential rules issue/ambiguity, and we hope someone can help!

When an area with a temporary fortification marker is attacked by forces including flying units, do the defending units subtract one from the total of regular damage in each of the attacker’s active iterations? Or do they not get any reduction?

The reasoning for this question being – a fortified area/border attacked by flying units is “to be treated as breached for as long as those flying units remain embattled”… and in the case of a temporary fortification marker, a “breach” results in removal of the marker…

So is a temporary fortification under flying attacked treated as a breached (permanent) fortification, or a “breached” temporary fort (i.e has no effect)?

Jon