There's an arrow in your hand (Feat)

[Orzel]

Spell Shooter [General]
Prerequisite: Dex 13, Base attack bonus +2,
Benefit: When you use a readied ranged attack to distract a spellcaster, add your Dexterity bonus to the Concentration DC.
Special: A fighter may select Spell Shot as one of his fighter bonus feats.


Arcane Spell Shooter [General]
Prerequisite: Dex 13, Spell Shooter, Enhance Arrow +2, Base attack bonus +2
Benefit: When you use a bow a readied ranged attack to distract a spellcaster, add your Arcane archer level to the Concentration DC.

There goes one Buff.