Lies My Rulebook Told Me

[Renojustin]

Blade Wind is a projectile attack, jotun boulders are projectile attacks, arrows are a projectile attack, anything that has an AOE is NOT a projectile attack.

If a projectile attack is parried by a shield, it is counted as a miss, and deals no damage. Secondary effects may or may not be counted, depending on the attack and/or effect. If it is not parried, damage is assessed against that unit's head or body, without the benefit of the shield (pretty sure).

Multiple projectiles in the same turn do not count toward reducing the shield parry, like multiple attacks count toward reducing the victim's defense do.

Hopefully that clarifies things!