Tom Cashel
First Post
[from the SRD]
Cover and Attacks of Opportunity
An attacker can't execute an attack of opportunity against a combatant with one-half or better cover.
[ibid.]
Shield creates an invisible, mobile disk of force that hovers in front of the character. It negates magic missile attacks directed at the character. The disk also intercepts attacks, providing three-quarters cover (+7 AC and +3 on Reflex saves against attacks that affect an area).
Huh. You learn something new about D&D every day.