Ashtagon
Adventurer
Feather Fall -- this affects all falling objects within a 10' cube, and gives them the mass of a piece of down. If you cast it on an object and can keep that object from ever reaching the ground, the spell remains in effect for up to 1 round/level. So even though your caster is occupied "playing with a floating feather," everyone inside that 10' cube is now immune to all missile fire.
Not quite. The spell affects "One Medium or smaller freefalling object or creature/level, no two of which may be more than 20 ft. apart". Which means if your enemies are more than 20 feet from you when you cast your spell, you can't possibly get this benefit. I'm not sure you can target a concealed object (such as ammunition) with this spell either, or even if the ammunition can count as a separate object while in another creature's possession, or even if you can target objects in another creature's possession.