Short answer:
Yes.
Explanation:
In order to answer this question, consider this CRF entry under “ally”:
Since Flatter a Foe is a card that directly affects an attack (i.e. it can cancel the attack), this committee’s ruling is that an ally is a character for the purposes of playing Flatter a Foe. Similar examples would be allies becoming wounded to fulfill the active condition of Escape, or a scout ally tapping to play Concealment.Allies count as characters for the purposes of combat, including performing actions in combat that characters do (getting assigned strikes, tapping for +1 to prowess) and for the play of cards that directly affect the attack.