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Guest 7037866
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It most certainly does imply that:Sure but the flavor text does not say or imply you can't make attacks against allies, it just states that enemies put themselves in danger.
Opportunity Attacks
Combatants watch for enemies to drop their guard. If you move heedlessly past your foes, you put yourself in danger by provoking an Opportunity Attack.As I said above...
Under OA it still discusses enemies and foes. And the very language "provoking creature" signifies enemy, foe, or otherwise hostile. You do not make OA on allies or friendly creatures.
With that being said, it isn't going to hurt anything if a group wanted to allow War Caster to buff allies as the move past them. I would be more concerned about the issues I raise above.