The Wolf Priest of Ulric (from TC 8) has a prayer called "Hammerschlag" (Difficulty 10), which reads: "The Wolf Priest calls down a hammer blow from Ulric on any model within 6". That model suffers a S4 attack from an enormous ethereal hammer, including the concussion special rule".
Now, does this mean:
A) ...on all models within 6", friend or foe.
B) ...on one model of your choise, within 6".
C) ...on any models you like (ie. all foes, no friends), within 6".
The wording's rather vague, and none of the interpretations seems really obvious to me.