Keenberg
First Post
Spiritual Weapon
You conjure a glowing weapon adorned with the symbol of your
deity. The weapon attacks one of your foes and guides your allies’
attacks against the same target.
From the flavor text, I could see the weapon standing there, acting as a beacon for your friends and giving them the bonus. However, it says the weapon attacks, not the character. I would never allow falling prone to "grant" a penalty. I wouldn't even allow closing your eyes to do so since you aren't swinging or guiding the weapon, it is an animate object fighting on it's own.
Furthermore
You have to make the attack when sustaining.Sustain Minor: When you sustain the power, repeat the
attack.
All in all, this is just a bad flavor choice for a pacifist. Why would a pacifist be conjuring weapons in the first place?