Thread: Swooping Hawks Grenade Pack Question

So in the grenade pack entry it says that the grenades are a separate weapon that do not exclude the character from firing another weapon, which is fine and good. After that it says that you must fire at the unit that had the grenades dropped on them if possible.
What if:
1) Unit is destroyed by the grenades or something else before you shoot the hawks?
2) The hawks are dropped in a way where they do not have line of sight to whom the grenades were dropped?

Does this allow the swooping hawks to fire at a different target in either of these cases or am I reading if possible too liberally?